APA (7th ed.) Citation

Waller, P. J., & Rowett, J. (1995). Chronology of the 20th century. Helicon.

Chicago Style (17th ed.) Citation

Waller, P. J., and John Rowett. Chronology of the 20th Century. Oxford, Great Britain: Helicon, 1995.

MLA (9th ed.) Citation

Waller, P. J., and John Rowett. Chronology of the 20th Century. Helicon, 1995.