Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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