Ball, J. E. (1991). Builders math, plans, specifications (6th ed.). Macmillan Pub..
Chicago Style (17th ed.) CitationBall, John E. Builders Math, Plans, Specifications. 6th ed. New York: Macmillan Pub., 1991.
MLA (9th ed.) CitationBall, John E. Builders Math, Plans, Specifications. 6th ed. Macmillan Pub., 1991.
Warning: These citations may not always be 100% accurate.