GERBER, P. L. (1969). Lessons in language. Wadsworth.
Lua i Stíl Chicago (17ú heag.)GERBER, Philip L. Lessons in Language. Belmont: Wadsworth, 1969.
Lua MLA (9ú heag.)GERBER, Philip L. Lessons in Language. Wadsworth, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.