APA (7th ed.) Citation

Boak, A. E. R., Slosson, P., & Anderson, H. R. World history. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Boak, Arthur Edward Romilly, Preston Slosson, and Howard R. Anderson. World History. Boston: Houghton Mifflin.

MLA (9th ed.) Citation

Boak, Arthur Edward Romilly, et al. World History. Houghton Mifflin.