Κυριλλίδου , Μ., & Young, M. (2006). ARL statistics 2004-05: A compilation of statistics from the one hundred and twenty-three members of the Association of Research Libraries. Washington, D.C.: Association of Research Libraries.

Κυριλλίδου , Μάρθα., and Mark Young. ARL Statistics 2004-05: A Compilation of Statistics From the One Hundred and Twenty-three Members of the Association of Research Libraries. Washington, D.C.: Association of Research Libraries, 2006.

Κυριλλίδου , Μάρθα., and Mark Young. ARL Statistics 2004-05: A Compilation of Statistics From the One Hundred and Twenty-three Members of the Association of Research Libraries. Washington, D.C.: Association of Research Libraries, 2006.