Gaya APA

Langer, William L.. (1972). An Encyclopedia Of World History (I. The Prehistoric Period - II. Ancient History) (Fifth). Boston: Houghton Mifflin Company.

Gaya Chicago

Langer, William L.. An Encyclopedia Of World History (I. The Prehistoric Period - II. Ancient History). Fifth Boston: Houghton Mifflin Company, 1972. Text.

Gaya MLA

Langer, William L.. An Encyclopedia Of World History (I. The Prehistoric Period - II. Ancient History). Fifth Boston: Houghton Mifflin Company, 1972. Text.

Gaya Turabian

Langer, William L.. An Encyclopedia Of World History (I. The Prehistoric Period - II. Ancient History). Fifth Boston: Houghton Mifflin Company, 1972. Print.