EARLE, J. H. (1978). Descriptive geometry.-- Ed.2. Addison-Wesley Pub. Co.
Lua i Stíl Chicago (17ú heag.)EARLE, James H. Descriptive Geometry.-- Ed.2. Massachusetts: Addison-Wesley Pub. Co, 1978.
Lua MLA (9ú heag.)EARLE, James H. Descriptive Geometry.-- Ed.2. Addison-Wesley Pub. Co, 1978.
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