Cita APA (7a ed.)

-. (1983). Grolier academic encyclopedi 18. Grolier Internasional.

Cita Chicago Style (17a ed.)

-. Grolier Academic Encyclopedi 18. (sl): Grolier Internasional, 1983.

Cita MLA (9a ed.)

-. Grolier Academic Encyclopedi 18. Grolier Internasional, 1983.