Gaya APA

Allen, W, L. (1998). National Geographic: Making Sense of the Millenium (Vol. 193, No. 1 Januari 1998). : National Geogrphic.

Gaya MLA

Allen, William, L.. "National Geographic: Making Sense of the Millenium". Vol. 193, No. 1 Januari 1998 : National Geogrphic, 1998. Text.