bibliographystyle

bibliographystyle

I wonder which bibliographystyle should be used.
According to the handbook of van Leunen van Leunen (1979), this paragraph| and certainly this section|should be longer than one sentence.
References
[1] Charles Louis Xavier Joseph de la Vall ee Poussin, 1879. A strong form of the prime number theorem, 19th century.
[2] K.S.Narendra and K.Parthsarathy. Identication and control of dynam- ical system using neural networks. IEENN, 1(1):4{27, 1990.
I tried this but I 'm getting this
References
de la Vall ee Poussin, Charles Louis Xavier Joseph. 1879. A strong form of the prime number theorem, 19th century.
K.S.Narendra, & K.Parthsarathy. 1990. Identication and Control of Dy- namical System using Neural Networks. IEENN, 1(1), 4{27.
Here is my code. ( taken from net)
\documentclass[11pt]{article}
\usepackage{natbib}
\author{John Doe} \title{Sample Document}
\begin{document}
\maketitle

\section{Introduction}
According to the handbook of van Leunen \citet{vanleunen},
this paragraph---and certainly this
section---should be longer than one sentence.

\section{More references}

Here we see if the reference \cite{Narendra_1990}
to the Narendra article comes out OK, in particular,
with volume, number \& pages.

The necessary information for those who would use BibTeX
is available in the 1988 document of Prof.\ Patashnik \cite{btxdoc}.
Interested readers who can read French may also
want to read Poussin's proof\cite{primes}, though
it has nothing at all to do with BibTeX.

\section{Conclusion}

This is the concluding paragraph.  Here I cite another of
Oren Patashnik's books\cite{btxhak} and, again,
van Leunen's and Poussin's \cite{vanleunen,primes}.
\bibliographystyle{authordate1}
%\bibliographystyle{plain}  % (uses file "plain.bst")
\bibliography{myrefs}       % expects file "myrefs.bib"
\end{document}
myrefs.bib
@string{jgr = "J.~Geophys.~Res."}

@MISC{primes,
   author = "Charles Louis Xavier Joseph de la Vall{\'e}e Poussin",
   note = "A strong form of the prime number theorem, 19th century",
   year = 1879
   }

@INBOOK{chicago,
   title = "The Chicago Manual of Style",
   publisher = "University of Chicago Press",
   edition = "Thirteenth",
   year = 1982,
   pages = "400--401",
   key = "Chicago"
   }

@BOOK{texbook,
   author = "Donald E. Knuth",
   title= "The {{\TeX}book}",
   publisher = "Addison-Wesley",
   year = 1984
   }

@BOOK{latexbook,
   author = "Leslie Lamport",
   title = "{\LaTeX \rm:} {A} Document Preparation System",
   publisher = "Addison-Wesley",
   year = 1986
   }

@UNPUBLISHED{btxdoc,
   author = "Oren Patashnik",
   title = "{Using BibTeX}",
   note = "Documentation for general BibTeX users",
   month = jan,
   year = 1988
   }

@UNPUBLISHED{btxhak,
   author = "Oren Patashnik",
   title = "Designing BibTeX Styles",
   note = "The part of BibTeX's documentation
                            that's not meant for general users",
   month = jan,
   year = 1988
   }

@BOOK{strunk,
   author = "Strunk, Jr., William and E. B. White",
   title = "The Elements of Style",
   publisher = "Macmillan",
   edition = "Third",
   year = 1979
   }

@book{vanleunen,
   title = "A Handbook for Scholars",
   author = "Mary-Claire van Leunen",
   publisher =