APA (7th ed.) Citation

Baker, R. H. (1940). An Introduction to astronomy. Van Nostrand.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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