APA (7th ed.) Citation

Hudson, K., & Nicholls, A. (1981). The directory of world museums (2nd ed.). Facts on File.

Chicago Style (17th ed.) Citation

Hudson, Kenneth, and Ann Nicholls. The Directory of World Museums. 2nd ed. New York, N.Y.: Facts on File, 1981.

MLA (9th ed.) Citation

Hudson, Kenneth, and Ann Nicholls. The Directory of World Museums. 2nd ed. Facts on File, 1981.