Spence, W. P., & Michael B. Atkins. (1980). Technical drafting: Metric design and communication. National Book Store.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpence, William Perkins, और Michael B. Atkins. Technical Drafting: Metric Design and Communication. Manila: National Book Store, 1980.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSpence, William Perkins, और Michael B. Atkins. Technical Drafting: Metric Design and Communication. National Book Store, 1980.
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