APA (7th ed.) Citation

Janson, M., & Opitz, H. (2011). World guide to libraries (25th ed.). K. G. Saur.

Chicago Style (17th ed.) Citation

Janson, Marlies, and Helmut Opitz. World Guide to Libraries. 25th ed. München: K. G. Saur, 2011.

MLA (9th ed.) Citation

Janson, Marlies, and Helmut Opitz. World Guide to Libraries. 25th ed. K. G. Saur, 2011.

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