APA (7th ed.) Citation

Williams, T. I., & Withers, S. (1969). A biographical dictionary of scientists. Black.

Chicago Style (17th ed.) Citation

Williams, Trevor I., and Sonia Withers. A Biographical Dictionary of Scientists. London: Black, 1969.

MLA (8th ed.) Citation

Williams, Trevor I., and Sonia Withers. A Biographical Dictionary of Scientists. Black, 1969.