APA (7th ed.) Citation

Willis, A., & Trench, W. (1998). Willis's elements of quantity surveying (9th ed.). Blackwell Science.

Chicago Style (17th ed.) Citation

Willis, Andrew, and William Trench. Willis's Elements of Quantity Surveying. 9th ed. Oxford, UK: Blackwell Science, 1998.

MLA (9th ed.) Citation

Willis, Andrew, and William Trench. Willis's Elements of Quantity Surveying. 9th ed. Blackwell Science, 1998.