APA (7th ed.) Citation

Willis, A. J., & Willis, C. J. (1971). Specification writing for architects and surveyors (6th ed., metric, revised.). Lockwood.

Chicago Style (17th ed.) Citation

Willis, Arthur James, and Christopher James Willis. Specification Writing for Architects and Surveyors. 6th ed., metric, revised. London: Lockwood, 1971.

MLA (9th ed.) Citation

Willis, Arthur James, and Christopher James Willis. Specification Writing for Architects and Surveyors. 6th ed., metric, revised. Lockwood, 1971.