Gaya APA

Gwinn, Robert P. [Et.al]. (1991). The New Encyclopaedia Britannica Volume 21: Macropaedia Knowledge in Depth (Copyright). Chicago: Encyclopaedia Britannica, Inc..

Gaya Chicago

Gwinn, Robert P. [Et.al]. The New Encyclopaedia Britannica Volume 21: Macropaedia Knowledge in Depth. Copyright Chicago: Encyclopaedia Britannica, Inc., 1991. Text.

Gaya MLA

Gwinn, Robert P. [Et.al]. The New Encyclopaedia Britannica Volume 21: Macropaedia Knowledge in Depth. Copyright Chicago: Encyclopaedia Britannica, Inc., 1991. Text.

Gaya Turabian

Gwinn, Robert P. [Et.al]. The New Encyclopaedia Britannica Volume 21: Macropaedia Knowledge in Depth. Copyright Chicago: Encyclopaedia Britannica, Inc., 1991. Print.