Cita APA (7th ed.)

Swehart, T. L. (1978). Journey through the universe: An introduction to astronomy. Houghton Mifflin.

Cita Chicago (17th ed.)

Swehart, Thomas L. Journey Through the Universe: An Introduction to Astronomy. Boston: Houghton Mifflin, 1978.

Cita MLA (9th ed.)

Swehart, Thomas L. Journey Through the Universe: An Introduction to Astronomy. Houghton Mifflin, 1978.