APA (7th ed.) Citation

(1991). World guide to libraries (10. ed.). <<de>> Gruyter Saur.

Chicago Style (17th ed.) Citation

World Guide to Libraries. 10. ed. Berlin: <<de>> Gruyter Saur, 1991.

MLA (9th ed.) Citation

World Guide to Libraries. 10. ed. <<de>> Gruyter Saur, 1991.

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