Gaya APA

Grosvenor, G, H. (1980). September 1980: National Geographic (September 1980). Washington D.C: National Geographic.

Gaya MLA

Grosvenor, Gilbert, Hovey. "September 1980: National Geographic". September 1980 Washington D.C: National Geographic, 1980. GEN - Bacaan/Seri Non-Fiksi.