APA (7th ed.) Citation

Clark, J. O. E., & Hemsley, W. (1991). Harrap's dictionary of science & technology: Edited by John O. E. Clark, William Hemsley. Harrap Books.

Chicago Style (17th ed.) Citation

Clark, John O. E., and William Hemsley. Harrap's Dictionary of Science & Technology: Edited by John O. E. Clark, William Hemsley. Bromley, Kent: Harrap Books, 1991.

MLA (8th ed.) Citation

Clark, John O. E., and William Hemsley. Harrap's Dictionary of Science & Technology: Edited by John O. E. Clark, William Hemsley. Harrap Books, 1991.