APA (7th ed.) Citation

Helsel, J. D., & Urbanick, B. (1990). Teacher's manual and answer key for Mechanical drawing: CAD-communications, 11th ed. and workbook for Mechanical drawing (11th ed.). Glencoe.

Chicago Style (17th ed.) Citation

Helsel, Jay D., and Byron Urbanick. Teacher's Manual and Answer Key for Mechanical Drawing: CAD-communications, 11th Ed. and Workbook for Mechanical Drawing. 11th ed. Lake Forest, Ill: Glencoe, 1990.

MLA (9th ed.) Citation

Helsel, Jay D., and Byron Urbanick. Teacher's Manual and Answer Key for Mechanical Drawing: CAD-communications, 11th Ed. and Workbook for Mechanical Drawing. 11th ed. Glencoe, 1990.