RYAN, M. (2012). Culture. McGraw-Hill Book Company.
Lua i Stíl Chicago (17ú heag.)RYAN, Michael. Culture. McGraw-Hill Book Company, 2012.
Lua MLA (9ú heag.)RYAN, Michael. Culture. McGraw-Hill Book Company, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.