\begin{thebibliography}{}
@article{ITS,
      author = {Donald Eastlake},
      title = {{ITS 1.5 Reference Manual}},
      journal = {{MIT AI Lab Memo}},
      number = {161A},
      month = {June},
      year = {1968}
,}

@article{RFC977,
      author = {Brian Kantor and Phil Lapsley},
      title = {{Network News Transfer Protocol}},
      month = {February},
      year = {1986}
}

@book{KR2,
      author = {Brian Kernighan and Dennis Ritchie},
      title = {{The C Programming Language, $2^{nd}$ edition}},
      publisher = {Prentice Hall},
      isbn = {0-13-110362-8},
      year = {1988}
}

\end{thebibliography}