APA (7th ed.) Citation

Spencer, H. C., Hill, I. L., & Loving, R. O. (1969). Engineering graphics problems: Series 1. Macmillan.

Chicago Style (17th ed.) Citation

Spencer, Henry Cecil, Ivan Leroy Hill, and R. O. Loving. Engineering Graphics Problems: Series 1. [New York]: Macmillan, 1969.

MLA (9th ed.) Citation

Spencer, Henry Cecil, et al. Engineering Graphics Problems: Series 1. Macmillan, 1969.