Gaya APA
Langer, William L.. (1972).
An Encyclopedia Of World History (III. The Middle Ages) (Fifth).
Boston:
Houghton Mifflin Company.
Gaya Chicago
Langer, William L..
An Encyclopedia Of World History (III. The Middle Ages).
Fifth
Boston:
Houghton Mifflin Company,
1972.
Text.
Gaya MLA
Langer, William L..
An Encyclopedia Of World History (III. The Middle Ages).
Fifth
Boston:
Houghton Mifflin Company,
1972.
Text.
Gaya Turabian
Langer, William L..
An Encyclopedia Of World History (III. The Middle Ages).
Fifth
Boston:
Houghton Mifflin Company,
1972.
Print.