Cita APA (7th ed.)

Dale Jackson, D. (1982). Underground Worlds: Planet earth. Time-Life Book Inc.

Cita Chicago (17th ed.)

Dale Jackson, Donald. Underground Worlds: Planet Earth. Chicago, Illinois: Time-Life Book Inc, 1982.

Cita MLA (9th ed.)

Dale Jackson, Donald. Underground Worlds: Planet Earth. Time-Life Book Inc, 1982.