Gaya APA
Gruber, B. (2011).
Inka Kuno: Selidik National Geographic (Cetakan Pertama).
Washington, D.C.:
National Geographic.
Gaya MLA
Gruber, Beth.
"Inka Kuno: Selidik National Geographic".
Cetakan Pertama
Washington, D.C.:
National Geographic,
2011.
Text.