Frey, D. (1999). Autocad 2000: No experience required. San Francisco: Sybex.
Trích dẫn kiểu ChicagoFrey, David. Autocad 2000: No Experience Required. San Francisco: Sybex, 1999.
Deismireacht MLAFrey, David. Autocad 2000: No Experience Required. San Francisco: Sybex, 1999.
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