APA Style

Johns, C. (2011). National Geographic : 50 Greatest Pictures from pages of national geographic magazine (Vol. 17 tahun 2011). Arizona: University of Arizona.

MLA Style

Johns, Chris. "National Geographic : 50 Greatest Pictures from pages of national geographic magazine". Vol. 17 tahun 2011 Arizona: University of Arizona, 2011. Perpustakaan KALBIS.