Parkinson, A. (1968). Foundations of technical drawing: Metric and third-angle edition (Metric ed.). Pitman.
Chicago-viite (17. p.)Parkinson, A.C. Foundations of Technical Drawing: Metric and Third-angle Edition. Metric ed. London: Pitman, 1968.
MLA-viite (9. p.)Parkinson, A.C. Foundations of Technical Drawing: Metric and Third-angle Edition. Metric ed. Pitman, 1968.
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