APA (7e ed.) Bronvermelding

Platt, N., & Drummond, M. J. (1960). Our world through the ages: Key to workbook. Prentice-Hall, Inc..

Chicago (17e ed.) Bronvermelding

Platt, Nathaniel, en Muriel Jean Drummond. Our World Through the Ages: Key to Workbook. Englewood Cliffs, N.J.: Prentice-Hall, Inc., 1960.

MLA (8e ed.) Bronvermelding

Platt, Nathaniel, en Muriel Jean Drummond. Our World Through the Ages: Key to Workbook. Prentice-Hall, Inc., 1960.