Gill, P. (1987). A textbook of machine drawing (11th ed.). Katson.
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Dyfyniad Arddull Chicago
Gill, P.S. A Textbook of Machine Drawing. 11th ed. Delhi: Katson, 1987.
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Dyfyniad MLA
Gill, P.S. A Textbook of Machine Drawing. 11th ed. Katson, 1987.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.