APA (7th ed.) Citation

Gilmour, J. K. (2003). The Practical Astronomer's Deep-sky Companion. Springer London.

Chicago Style (17th ed.) Citation

Gilmour, Jess K. The Practical Astronomer's Deep-sky Companion. London: Springer London, 2003.

MLA (9th ed.) Citation

Gilmour, Jess K. The Practical Astronomer's Deep-sky Companion. Springer London, 2003.