Whitley, B. E. (2002). Principles of research In behavioral scienceBernard E.Witley,Jr. Mc Graw-Hill.
Lua i Stíl Chicago (17ú heag.)Whitley, Bernard E.Jr. Principles of Research In Behavioral ScienceBernard E.Witley,Jr. Mc Graw-Hill, 2002.
Lua MLA (8ú heag.)Whitley, Bernard E.Jr. Principles of Research In Behavioral ScienceBernard E.Witley,Jr. Mc Graw-Hill, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.