APA (7th ed.) Citation

Sheehy, E. P. (1980). Guide to reference books, 9th edition: Supplement. American Library Association.

Chicago Style (17th ed.) Citation

Sheehy, Eugene P. Guide to Reference Books, 9th Edition: Supplement. Chicago: American Library Association, 1980.

MLA (9th ed.) Citation

Sheehy, Eugene P. Guide to Reference Books, 9th Edition: Supplement. American Library Association, 1980.

Warning: These citations may not always be 100% accurate.