Gaya APA

Dkk, C, M, V. (2004). WORLD BOOK'S CHILDCRAFT: OUR EARTH (12). USA: World Book, Inc..

Gaya MLA

Dkk, Cathy, Melloan,, Volcano. "WORLD BOOK'S CHILDCRAFT: OUR EARTH". 12 USA: World Book, Inc., 2004. Text.