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.
.