Spence, W. P. (1991). Drafting: Technology and practice (3rd ed.). Glencoe/ Mcmillan/McGraw-Hill.
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Dyfyniad Arddull Chicago
Spence, William P. Drafting: Technology and Practice. 3rd ed. California: Glencoe/ Mcmillan/McGraw-Hill, 1991.
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Dyfyniad MLA
Spence, William P. Drafting: Technology and Practice. 3rd ed. Glencoe/ Mcmillan/McGraw-Hill, 1991.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.