APA (7th ed.) Citation

Janson, M., & Opitz, H. (2012). World guide to libraries (26th ed.). K. G. Saur.

Chicago Style (17th ed.) Citation

Janson, Marlies, and Helmut Opitz. World Guide to Libraries. 26th ed. München: K. G. Saur, 2012.

MLA (9th ed.) Citation

Janson, Marlies, and Helmut Opitz. World Guide to Libraries. 26th ed. K. G. Saur, 2012.

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