APA (7th ed.) Citation

Duncan, J. C. (1935). Astronomy: A textbook (3d ed. rev., 1935.). Harper.

Chicago Style (17th ed.) Citation

Duncan, John Charles. Astronomy: A Textbook. 3d ed. rev., 1935. New York, London: Harper, 1935.

MLA (9th ed.) Citation

Duncan, John Charles. Astronomy: A Textbook. 3d ed. rev., 1935. Harper, 1935.