APA (7th ed.) Citation

Baker, R. H. (1955). Astronomy: A textbook for university and college students (6th ed.). Van Nostrand.

Chicago Style (17th ed.) Citation

Baker, Robert Horace. Astronomy: A Textbook for University and College Students. 6th ed. New York: Van Nostrand, 1955.

MLA (9th ed.) Citation

Baker, Robert Horace. Astronomy: A Textbook for University and College Students. 6th ed. Van Nostrand, 1955.