APA (7th ed.) Citation

Janson, M., & Opitz, H. (2008). World guide to libraries (23rd ed.). K. G. Saur.

Chicago Style (17th ed.) Citation

Janson, Marlies, and Helmut Opitz. World Guide to Libraries. 23rd ed. München: K. G. Saur, 2008.

MLA (9th ed.) Citation

Janson, Marlies, and Helmut Opitz. World Guide to Libraries. 23rd ed. K. G. Saur, 2008.

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