non-indentation of the second line of bibliograpy

Question

I would like to print my references part non-indented. I have found information regarding how to indent bib items, but not regarding my problem. I am trying to have the second line of references non-indented as obeying the margin restrictions of the rest of my document which are provided by \geometry{verbose,tmargin=1.25in,bmargin=1.25in,lmargin=1.4in,rmargin=1.15in} command. 'bibliography' file includes my references. Thanks very much in advance! Here is my MWE:

\documentclass[12pt]{report}
\usepackage[letterpaper]{geometry}
\geometry{verbose,tmargin=1.25in,bmargin=1.25in,
lmargin=1.4in,rmargin=1.15in}
\usepackage[doublespacing]{setspace}
\usepackage{indentfirst}

\begin{document}
Text goes here. ..\cite{ito92, joannopoulos95}
Here, n describes the increase in P1 by nucleation. The gain
($gP_{L-1}$) and loss ($-P_{L}$) terms are due to subunit addition.

\bibliographystyle{unsrt}
\bibliography{references}

\end{document}

The compiled file is

Answer 1

Note: this is VERY hacky. Perhaps there is a smarter way to do this. Anyway:

\documentclass[12pt]{report}
\usepackage[letterpaper]{geometry}
\geometry{verbose,tmargin=1.25in,bmargin=1.25in,
lmargin=1.4in,rmargin=1.15in}
\usepackage[doublespacing]{setspace}
\usepackage{indentfirst}
\usepackage{enumitem}
\makeatletter
\renewenvironment{thebibliography}[1]
     {\chapter*{\bibname}%
      \setbox2\hbox{\@biblabel{#1}}
      \@mkboth{\MakeUppercase\bibname}{\MakeUppercase\bibname}%
      \begin{enumerate}[itemindent=!,leftmargin=0pt,label={\@biblabel{\@arabic\c@enumiv}\setbox2\hbox{\@biblabel{\@arabic\c@enumiv}}\hspace{\labelwidth}\hspace{-\wd2}},labelwidth=\wd2]
            \usecounter{enumiv}%
      \sloppy
      \clubpenalty4000
      \@clubpenalty \clubpenalty
      \widowpenalty4000%
      \sfcode`\.\@m}
     {\def\@noitemerr
       {\@latex@warning{Empty `thebibliography' environment}}%
      \end{enumerate}}
\makeatother

\begin{document}
Text goes here. ..\cite{ito92, joannopoulos95}

Here, n describes the increase in P1 by nucleation. The gain ($gP_{L-1}$) and loss ($-P_{L}$) terms are due to subunit addition.

\bibliographystyle{unsrt} \bibliography{references}

\begin{thebibliography}{11}
\bibitem{ito92}
Foo Bar Baz,
\emph{Lorem Ipsum dolor sit amet},
Consectetuer editions,
March 24th, 1993,
Rivendell.
\bibitem{mu}
qef
\bibitem{2424}
oihoiwrgh
\bibitem{qeqefqe}
3t31tsef
\bibitem{214}
qeeqfr
\bibitem{1235689}
12345678900987654321
\bibitem{3215}
asdsad
\bibitem{124124}
14124124
\bibitem{134134}
adgvadagd
\bibitem{foobarbazbellheisenbug}
Schrodinbug Heisenbug Schrodinbug Lorem ipsum dolor sit amet consectetuer adipiscing elit foobar
\end{thebibliography}
\end{document}

I redefined the bibliography environment to use an enumerate environment from enumitem, and fiddling with the parameters I managed to get the desired result. Many pieces of code are copied off the definition of the bibliography environment taken from report. My edits are in the part from \setbox1 to \usecounter. There, I set box 1 to \@biblabel{#1} which is the correct label width as was previously set by the class. \@mkboth is off the class. Then we have the list. THe options itemindent and leftmargin are set as suggested by "Original answer" here, so thank karlkoeller for that. label= is sorf of copied off the class, though the \hspace is what solved the problem in the comment's screenshot, or rather the variant where 1 was a bit to the right of the left margin: basically it places exactly enough space to align the 1 with the second line. labelwidth= takes the width of box 1 at the moment of the list's start (so box 1 is what was set by \setbox1) as its value. So the label width is, in this case, [10]'s width, but when the label would be tighter it is not flushed right but an \hspace is inserted that gets it exactly aligned on the left. Here is the output:

Is that it?

---

Simplified version still using enumitem

Change the code between \makeatletter and \makeatother with

\makeatletter
\newlength\biblabelwd
\renewenvironment{thebibliography}[1]
 {\chapter*{\bibname}%
  \@mkboth{\MakeUppercase\bibname}{\MakeUppercase\bibname}%
  \settowidth\biblabelwd{\@biblabel{#1} }%
  \begin{enumerate}[
    itemindent=\biblabelwd,
    leftmargin=0pt,
    label={\makebox[\biblabelwd][l]{\@biblabel{\arabic{enumiv}}}},
    labelwidth=0pt,
    labelsep=0pt
  ]
  \usecounter{enumiv}%
  \sloppy
  \clubpenalty4000
  \@clubpenalty \clubpenalty
  \widowpenalty4000%
  \sfcode`\.\@m}
 {\def\@noitemerr
  {\@latex@warning{Empty `thebibliography' environment}}%
  \end{enumerate}}
\makeatother