APA (7th ed.) Citation

Ploetz, C., Tillinghast, W. H., & Barnes, H. E. (1925). Ploetz' epitome of history. Blue ribbon Books.

Chicago Style (17th ed.) Citation

Ploetz, Carl, William H. Tillinghast, and Harry Elmer Barnes. Ploetz' Epitome of History. New York: Blue ribbon Books, 1925.

MLA (8th ed.) Citation

Ploetz, Carl, et al. Ploetz' Epitome of History. Blue ribbon Books, 1925.