APA (7th ed.) Citation

Butowsky, H. A. (1989). Astronomy and astrophysics. Department of the Interior, National Park Service.

Chicago Style (17th ed.) Citation

Butowsky, Harry A. Astronomy and Astrophysics. Washington, D.C.: Department of the Interior, National Park Service, 1989.

MLA (9th ed.) Citation

Butowsky, Harry A. Astronomy and Astrophysics. Department of the Interior, National Park Service, 1989.

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