APA (7th ed.) Citation

Willis, A. J., & Willis, C. J. (1969). Elements of quantity surveying (6th ed. (metric).). Crosby Lockwood.

Chicago Style (17th ed.) Citation

Willis, Arthur James, and Christopher James Willis. Elements of Quantity Surveying. 6th ed. (metric). London: Crosby Lockwood, 1969.

MLA (9th ed.) Citation

Willis, Arthur James, and Christopher James Willis. Elements of Quantity Surveying. 6th ed. (metric). Crosby Lockwood, 1969.