APA (7th ed.) Citation

Sitchin, Z. (1978). The 12th planet. Avon Books.

Chicago Style (17th ed.) Citation

Sitchin, Zecharia. The 12th Planet. New York: Avon Books, 1978.

MLA (9th ed.) Citation

Sitchin, Zecharia. The 12th Planet. Avon Books, 1978.

Warning: These citations may not always be 100% accurate.