APA (7th ed.) Citation

Baker, R. H. (1940). An introduction to astronomy. D. Van Nostrand Company.

Chicago Style (17th ed.) Citation

Baker, Robert Horace. An Introduction to Astronomy. New York: D. Van Nostrand Company, 1940.

MLA (9th ed.) Citation

Baker, Robert Horace. An Introduction to Astronomy. D. Van Nostrand Company, 1940.

Warning: These citations may not always be 100% accurate.