Gaya APA

Grolier, I. (2001). The New Book Of Knowledge Volume 21 ; combined index to the new book of knowledge (Trawas) . Danbury: Grolier Incorporated.

Gaya MLA

Grolier, Incorporated. "The New Book Of Knowledge Volume 21 ; combined index to the new book of knowledge (Trawas)". Danbury: Grolier Incorporated, 2001. Text.