Cita APA (7th ed.)

Sheehy, E. P. (1976). Guide to reference books (9th ed.). American Library Association.

Cita Chicago (17th ed.)

Sheehy, Eugene Paul. Guide to Reference Books. 9th ed. Chicago: American Library Association, 1976.

Cita MLA (9th ed.)

Sheehy, Eugene Paul. Guide to Reference Books. 9th ed. American Library Association, 1976.