documentclass{article}
begin{document}
noindentbegin{minipage}{.5textwidth}
  begin{thebibliography}{1}
    bibitem{a1}Abibitem{b1}Abibitem{c1}Abibitem{d1}Abibitem{e1}A
    bibitem{f1}Abibitem{g1}Abibitem{h1}Abibitem{i1}Abibitem{j1}A
  end{thebibliography}
end{minipage}%
begin{minipage}{.5textwidth}
  begin{thebibliography}{11}
    bibitem{a2}Abibitem{b2}Abibitem{c2}Abibitem{d2}Abibitem{e2}A
    bibitem{f2}Abibitem{g2}Abibitem{h2}Abibitem{i2}Abibitem{j2}A
  end{thebibliography}
end{minipage}
end{document}