An introduction to astronomy,
by Robert H. Baker.

APA Citation

Baker, R. Horace. (1940). An introduction to astronomy: by Robert H. Baker. 2d ed. New York: Van Nostrand.

MLA Citation

Baker, Robert Horace, 1883-. An Introduction to Astronomy: by Robert H. Baker. 2d ed. New York: Van Nostrand, 1940.

Warning: These citations may not always be complete (especially for serials).