APA (7th ed.) Citation

Boak, A. E. R., Slosson, P., & Anderson, H. R. World history: In two volumes. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Boak, Arthur Edward Romilly, Preston Slosson, and Howard R. Anderson. World History: In Two Volumes. Boston [u.a.]: Houghton Mifflin.

MLA (9th ed.) Citation

Boak, Arthur Edward Romilly, et al. World History: In Two Volumes. Houghton Mifflin.