Berger, P. L. (1970). Invitation to Sociology: A Humanistic Perspective. Penguin Books.
Lua i Stíl Chicago (17ú heag.)Berger, Peter L. Invitation to Sociology: A Humanistic Perspective. Harmondsworth [u.a.]: Penguin Books, 1970.
Lua MLA (8ú heag.)Berger, Peter L. Invitation to Sociology: A Humanistic Perspective. Penguin Books, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.