APA (7th ed.) Citation

Ley, W. (1969). Visitors from afar: The comets. McGraw-Hill.

Chicago Style (17th ed.) Citation

Ley, Willy. Visitors from Afar: The Comets. New York: McGraw-Hill, 1969.

MLA (9th ed.) Citation

Ley, Willy. Visitors from Afar: The Comets. McGraw-Hill, 1969.