@article{serre1977linear,
  title={Linear representations of finite groups},
  author={Serre, Jean-Pierre},
  year={1977},
  publisher={Springer}
  }

documentclass[11pt, a4paper]{report}
usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}
usepackage{bm}
usepackage{nccmath}
usepackage{amsfonts, graphicx, verbatim, mathtools,amssymb, amsthm, mathrsfs}
usepackage{color}
usepackage{array}
usepackage{setspace}% if you must (for double spacing thesis)
usepackage{fancyhdr}
usepackage{enumitem}
usepackage{tikz}
usepackage{parskip}
usepackage{lipsum}
usepackage{floatrow}

usepackage[style=numeric,maxbibnames=99,sortcites=true,backend=bibtex]{biblatex}

bibliography{groups & representations ref}

begin{document}
A group is a set $G$ together with a binary operation $*$ on $G$ satisfying
the following properties:cite{serre1977linear}

printbibliography
end{document}

RequirePackage{filecontents}
begin{filecontents}{References.bib}
@book{serre1977linear,
  title   = {Linear Representations of Finite Groups},
  author  = {Serre, Jean-Pierre},
  year    = {1977},
  publisher={Springer},
  address = {Berlin},
  series  = {Graduate Texts in Mathematics},
  number  = 42,
}
end{filecontents}

documentclass[11pt, a4paper]{article} % or 'report'
usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}
%omitted packages that are irrelvant for example at hand

usepackage[style=numeric,maxbibnames=99,sortcites=true,
            backend=bibtex]{biblatex}
addbibresource{References.bib}

begin{document}
A group is a set $G$ together with a binary operation~$*$
on~$G$ satisfying the following properties: cite{serre1977linear}

printbibliography
end{document}