APA (7th ed.) Citation

Platt, N., & Drummond, M. J. (1955). Key to workbook for Our world through the ages. Prentice-Hall.

Chicago Style (17th ed.) Citation

Platt, Nathaniel, and Muriel Jean Drummond. Key to Workbook for Our World Through the Ages. Englewood Cliffs, N. J.: Prentice-Hall, 1955.

MLA (8th ed.) Citation

Platt, Nathaniel, and Muriel Jean Drummond. Key to Workbook for Our World Through the Ages. Prentice-Hall, 1955.