APA (7th ed.) Citation

Slosson, P. W., Slosson, E. E., & Shotwell, J. T. Twentieth century Europe. Houghton Mifflin,c[c1927].

Chicago Style (17th ed.) Citation

Slosson, Preston William, Edwin Emery Slosson, and James Thomson Shotwell. Twentieth Century Europe. Boston: Houghton Mifflin,c[c1927].

MLA (9th ed.) Citation

Slosson, Preston William, et al. Twentieth Century Europe. Houghton Mifflin,c[c1927].