Cita APA (7a ed.)

Sin autor. (1998). Peterson's guide to distance learning programs (3rd ed.). Peterson's.

Cita Chicago Style (17a ed.)

Sin autor. Peterson's Guide to Distance Learning Programs. 3rd ed. Princeton: Peterson's, 1998.

Cita MLA (9a ed.)

Sin autor. Peterson's Guide to Distance Learning Programs. 3rd ed. Peterson's, 1998.