APA (7th ed.) Citation

Hudson, K., & Nicholls, A. (1975). The directory of world museums. Columbia University Press.

Chicago Style (17th ed.) Citation

Hudson, Kenneth, and Ann Nicholls. The Directory of World Museums. New York: Columbia University Press, 1975.

MLA (9th ed.) Citation

Hudson, Kenneth, and Ann Nicholls. The Directory of World Museums. Columbia University Press, 1975.