Gaya APA
Graves, W. (1992).
October 1992: National Geographic VOL. 182, NO. 4 (October 1992).
Washington D.C:
National Geographic.
Gaya MLA
Graves, William.
"October 1992: National Geographic VOL. 182, NO. 4".
October 1992
Washington D.C:
National Geographic,
1992.
Text.