Jensen, C., & Helsel, J. D. (1990). Engineering drawing and design (4th ed.). Glencoe.
Lua i Stíl Chicago (17ú heag.)Jensen, Cecil, agus Jay D. Helsel. Engineering Drawing and Design. 4th ed. New York: Glencoe, 1990.
Lua MLA (9ú heag.)Jensen, Cecil, agus Jay D. Helsel. Engineering Drawing and Design. 4th ed. Glencoe, 1990.
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