Gaya APA
ENCYCLOPEDIA AMERICANA VOLUME 21. (1978).
U.S.A.:
Library of Congress Cataloging in Publication Data.
Gaya Chicago
ENCYCLOPEDIA AMERICANA VOLUME 21.
.
U.S.A.:
Library of Congress Cataloging in Publication Data,
1978.
Text.
Gaya MLA
ENCYCLOPEDIA AMERICANA VOLUME 21.
.
U.S.A.:
Library of Congress Cataloging in Publication Data,
1978.
Text.
Gaya Turabian
ENCYCLOPEDIA AMERICANA VOLUME 21.
U.S.A.:
Library of Congress Cataloging in Publication Data,
1978.
Print.