CRAWLEY, M. (2015). STATISTICS (2ND ED.). WILEY.
Lua i Stíl Chicago (17ú heag.)CRAWLEY, MICHAEL.J. STATISTICS. 2ND ED. UNITED KINGDOM: WILEY, 2015.
Lua MLA (9ú heag.)CRAWLEY, MICHAEL.J. STATISTICS. 2ND ED. WILEY, 2015.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.