APA (7th ed.) Citation

Murdin & Penston. (2004). The firefly encyclopedia of astronomy. Firely Books.

Chicago Style (17th ed.) Citation

Murdin and Penston. The Firefly Encyclopedia of Astronomy. Canada: Firely Books, 2004.

MLA (8th ed.) Citation

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

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