Gaya APA

Zoehfeld, K, W., Meisel, P. (1998). What Is The World Made Of ? All About Solids, Liquids, and Gases . New York: Harper Collins.

Gaya MLA

Zoehfeld, Kathleen, Weidner., Meisel, Paul. "What Is The World Made Of ? All About Solids, Liquids, and Gases". New York: Harper Collins, 1998. Text.