Gaya APA
Sitchin, Z. (2007).
The 12th planet: Book I of the Earth Chronicles. Cet.I 1976 .
New York:
New York HarperCollinsPublishers.
Gaya MLA
Sitchin, Zecharia.
"The 12th planet: Book I of the Earth Chronicles. Cet.I 1976 ".
New York:
New York HarperCollinsPublishers,
2007.
Buku.