Gaya APA

Incorporated, G. (). Grolier Encyclopedia of Knowledge Vol. 20: Wor-Zyg; Index (cet. 1). United States of Ame: Academic American Encyclopedia.

Gaya MLA

Incorporated, Grolier. "Grolier Encyclopedia of Knowledge Vol. 20: Wor-Zyg; Index". cet. 1 United States of Ame: Academic American Encyclopedia, . Text.