Cita APA (7a ed.)

Johnson, B. E. (1989). A world of difference. Johns Hopkins university press.

Cita Chicago Style (17a ed.)

Johnson, Barbara Ellen. A World of Difference. Baltimore (Md.) ; London: Johns Hopkins university press, 1989.

Cita MLA (8a ed.)

Johnson, Barbara Ellen. A World of Difference. Johns Hopkins university press, 1989.