APA (7th ed.) Citation

International ISBN Agency. (1989). Publishers' international ISBN directory: 25th edition 1998/99. International ISBN Agency.

Chicago Style (17th ed.) Citation

International ISBN Agency. Publishers' International ISBN Directory: 25th Edition 1998/99. International ISBN Agency, 1989.

MLA (8th ed.) Citation

International ISBN Agency. Publishers' International ISBN Directory: 25th Edition 1998/99. International ISBN Agency, 1989.

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