Gaya APA
Encyclopedia International - 20 Index. (1970 & 1974).
New York:
Grolier Incorporated.
Gaya Chicago
Encyclopedia International - 20 Index.
.
New York:
Grolier Incorporated,
1970 & 1974.
Text.
Gaya MLA
Encyclopedia International - 20 Index.
.
New York:
Grolier Incorporated,
1970 & 1974.
Text.
Gaya Turabian
Encyclopedia International - 20 Index.
New York:
Grolier Incorporated,
1970 & 1974.
Print.