Cita APA (7th ed.)

Winchell, C. M., American Library Association, & Sheehy, E. P. (1968). Guide to reference books: First supplement6, 1965-1966 (8th ed.). American Library Association.

Cita Chicago (17th ed.)

Winchell, Constance Mabel, American Library Association, i Eugene P. Sheehy. Guide to Reference Books: First Supplement6, 1965-1966. 8th ed. Chicago: American Library Association, 1968.

Cita MLA (9th ed.)

Winchell, Constance Mabel, et al. Guide to Reference Books: First Supplement6, 1965-1966. 8th ed. American Library Association, 1968.