APA Style
Collier's encyclopedia VOL.21. (1990).
New York:
MACMILLAN EDUCATIONAL COMPANY.
Chicago Style
Collier's encyclopedia VOL.21.
.
New York:
MACMILLAN EDUCATIONAL COMPANY,
1990.
.
MLA Style
Collier's encyclopedia VOL.21.
.
New York:
MACMILLAN EDUCATIONAL COMPANY,
1990.
.
Turabian Style
Collier's encyclopedia VOL.21.
New York:
MACMILLAN EDUCATIONAL COMPANY,
1990.
.