APA (7th ed.) Citation

Bakers, R. H. (1961). An introduction to astronomy. D. Van Nostrand.

Chicago Style (17th ed.) Citation

Bakers, Robert H. An Introduction to Astronomy. Princeton, NJ: D. Van Nostrand, 1961.

MLA (9th ed.) Citation

Bakers, Robert H. An Introduction to Astronomy. D. Van Nostrand, 1961.