I tried a lot of times, but the reference list doesn't appear and the citation in the text is always a question mark. This is my bib file.  \begin{filecontents}{mybib.bib} @booklet{mwe, author      = {{S}charrer, {M}artin}, year        = {2012}, title       = {The mwe-Package}, edition     = {0.3}, language    = {english}, lastchecked = {2012-07-12}, url         = {http://mirror.ctan.org/pkg/mwe}, note        = {macros/latex/contrib/mwe} }  @Book{Renewal, author = {Breuer, L. and Baum, D.}, title = {An Introduction to Queueing Theory and Matrix-Analytic Methods}, publisher = {Springer}, year = 2005, } \end{filecontents}   Next is my tex file.  \documentclass[a5paper]{article}  \usepackage{filecontents}      \usepackage[numbers]{natbib}   \usepackage{hyperref}           \begin{document} \section{First section}  Minimal Working Example MWE.  citations: \cite{Renewal}, \citep{mwe}, \citet{mwe}, \citep*{mwe}.   \bibliographystyle{unsrtnat}   \bibliography{mybib}           \end{document}   Both of 2 files are from a buddy's answer in the website.
I've browsed the forums and found a number of posts that have addressed this issue, but none of the solutions seem to work for me. I have the following script that I just copied from the bibtex home page to get familiar with it. Instead of the citation number I get a question mark. I compile using Latex+Bibtex+Latex+Latex+PDFLatex+ViewPDF just as has been previously suggested and the problem persists.   \documentclass[11pt]{article} \usepackage{cite}  \begin{document}  \title{My Article} \author{Nobody Jr.} \date{Today} \maketitle  Blablabla said Nobody ~\cite{Nobody06}.  \bibliography{mybib} \bibliographystyle{plain} \end{document}   My bibliography (Bib.bbl)  @misc{ Nobody06, author = "Nobody Jr", title = "My Article", year = "2006" }    Looking at previous posts one thing that is concerning is that my .bbl looks empty as shown below. Further, I don't have a .blg  \begin{thebibliography}{}  \end{thebibliography}
Prove that $\frac{R/ \ker \phi}{(\ker \phi + J)/ \ker \phi} \cong \frac{S}{\phi(J)}$ Let $\phi: R \to S$ be a surjective homomorphism. Prove that $\frac{R/ \ker \phi}{(\ker \phi + J)/ \ker \phi} \cong \frac{S}{\phi(J)}$ for an ideal $J$ of $R.$  Obviously, $S \cong R/ \ker \phi$(first isomorphism theorem) and $\phi(J)$ is an ideal of $S$, since $\phi$ is surjective( $\forall s \in \phi(J), s = \phi(j)$ for some $j \in J, \forall s' \in S, s' = \phi(r)$ for some $r \in R$, so $ss' = \phi(j)\phi(r) = \phi(jr) \in \phi(J)$, and $ss' = \phi(r)\phi(j) = \phi(rj) \in \phi(J)$ ).  However, I'm having trouble with going on. If it's important, I mean a unitary ring by a ring. Will it be possible to create apps/games in Java SE or Java ME on new Ubuntu phones? Stop sound from speakers when connecting headphones I guess this question already had the answer here but I can't find it. I'm using 12.04.  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