Ledermann, W. (1973). Introduction to group theory. Longman.
Lua i Stíl Chicago (17ú heag.)Ledermann, W. Introduction to Group Theory. London: Longman, 1973.
Lua MLA (9ú heag.)Ledermann, W. Introduction to Group Theory. Longman, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.