APA

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

Chicago

Hudson Kenneth, Nicholls Ann, . 1975. The directory of world museums. New York: Columbia University Press.

Harvard

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

MLA

Hudson Kenneth, Nicholls Ann, . The directory of world museums. New York: Columbia University Press. 1975.