Gaya APA

The Encyclopedia Americana Vol. 21 International Edition. (1973). USA: AMERICANA CORPORATION.

Gaya Chicago

The Encyclopedia Americana Vol. 21 International Edition. . USA: AMERICANA CORPORATION, 1973. .

Gaya MLA

The Encyclopedia Americana Vol. 21 International Edition. . USA: AMERICANA CORPORATION, 1973. .

Gaya Turabian

The Encyclopedia Americana Vol. 21 International Edition. USA: AMERICANA CORPORATION, 1973. .