APA (7th ed.) Citation

North, J. D., & Porter, R. (1994). The Norton history of astronomy and cosmology (1st American ed.). Norton.

Chicago Style (17th ed.) Citation

North, John David, and Roy Porter. The Norton History of Astronomy and Cosmology. 1st American ed. New York: Norton, 1994.

MLA (8th ed.) Citation

North, John David, and Roy Porter. The Norton History of Astronomy and Cosmology. 1st American ed. Norton, 1994.