APA (7th ed.) Citation

Murdin, P., & Penston, M. (2004). The Firefly encyclopedia of astronomy. Firefly Books.

Chicago Style (17th ed.) Citation

Murdin, Paul, and Margaret Penston. The Firefly Encyclopedia of Astronomy. Buffalo, N.Y.: Firefly Books, 2004.

MLA (9th ed.) Citation

Murdin, Paul, and Margaret Penston. The Firefly Encyclopedia of Astronomy. Firefly Books, 2004.