APA (7th ed.) Citation

Ploetz, C., Tillinghast, W. H., & Barnes, H. E. (1925). Ploetz' manual of universal history. Houghton Mifflin company.

Chicago Style (17th ed.) Citation

Ploetz, Carl, William H. Tillinghast, and Harry Elmer Barnes. Ploetz' Manual of Universal History. Boston, New York [etc.]: Houghton Mifflin company, 1925.

MLA (9th ed.) Citation

Ploetz, Carl, et al. Ploetz' Manual of Universal History. Houghton Mifflin company, 1925.