APA (7th ed.) Citation

Bell, R. R. (1981). Worlds of friendship. Sage Publ.

Chicago Style (17th ed.) Citation

Bell, Robert R. Worlds of Friendship. Beverly Hills u.a: Sage Publ, 1981.

MLA (9th ed.) Citation

Bell, Robert R. Worlds of Friendship. Sage Publ, 1981.

Warning: These citations may not always be 100% accurate.