Cita APA (7th ed.)

Ley, W. (1969). Gas giants: The largest planets. McGraw-Hill.

Cita Chicago (17th ed.)

Ley, Willy. Gas Giants: The Largest Planets. New York: McGraw-Hill, 1969.

Cita MLA (9th ed.)

Ley, Willy. Gas Giants: The Largest Planets. McGraw-Hill, 1969.