APA (7th ed.) Citation

Humphrey, C. (1992). The amateur astronomer's pathfinder. John Wiley.

Chicago Style (17th ed.) Citation

Humphrey, Colin. The Amateur Astronomer's Pathfinder. Chichester, England: John Wiley, 1992.

MLA (9th ed.) Citation

Humphrey, Colin. The Amateur Astronomer's Pathfinder. John Wiley, 1992.