Gaya APA

Incorporated, G. (). Grolier Encyclopedia of Knowledge Volume 16: Ref-Sef (cet. 1). United States of Ame: Academic American Encyclopedia.

Gaya MLA

Incorporated, Grolier. "Grolier Encyclopedia of Knowledge Volume 16: Ref-Sef". cet. 1 United States of Ame: Academic American Encyclopedia, . Text.