GOETSCH, D. L., GOETSCH, D. M., & RICKMAN, R. L. (1988). Mathematics for the machine trades. Prentice-hall.
Lua i Stíl Chicago (17ú heag.)GOETSCH, David L., Deborah M. GOETSCH, agus Raymond L. RICKMAN. Mathematics for the Machine Trades. New Jersey: Prentice-hall, 1988.
Lua MLA (9ú heag.)GOETSCH, David L., et al. Mathematics for the Machine Trades. Prentice-hall, 1988.
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