Gaya APA

dkk., R, S, A. (1977). The Encyclopedia Americana International Edition: Orley to Photographic Telescope (Vol.21). New York: Americana Corporation.

Gaya MLA

dkk., Robert, S., Anderson,. "The Encyclopedia Americana International Edition: Orley to Photographic Telescope". Vol.21 New York: Americana Corporation, 1977. Text.