APA (7th ed.) Citation

(1991). Publishers' International ISBN Directory. 1 (18. ed.). K. G. Saur.

Chicago Style (17th ed.) Citation

Publishers' International ISBN Directory. 1. 18. ed. München: K. G. Saur, 1991.

MLA (9th ed.) Citation

Publishers' International ISBN Directory. 1. 18. ed. K. G. Saur, 1991.

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