Gaya APA
Sitchin, Z. (2007).
The stairway to heaven: Book II of the Earth Chronicles. Cet.I 1980 .
New York:
New York HarperCollinsPublishers.
Gaya MLA
Sitchin, Zecharia.
"The stairway to heaven: Book II of the Earth Chronicles. Cet.I 1980 ".
New York:
New York HarperCollinsPublishers,
2007.
Buku.