APA

Baker R. H., . (1950). Astronomy: a textbook for university and college students. New York: D. Van Nostrand Company, Inc.

Chicago

Baker Robert Horace, . 1950. Astronomy: a textbook for university and college students. New York: D. Van Nostrand Company, Inc.

Harvard

Baker R. H., . (1950). Astronomy: a textbook for university and college students. New York: D. Van Nostrand Company, Inc.

MLA

Baker Robert Horace, . Astronomy: a textbook for university and college students. New York: D. Van Nostrand Company, Inc. 1950.