Spence, W. P., & Michael B. Atkins. (1980). Technical drafting: Metric design and communication. National Book Store.
Lua i Stíl Chicago (17ú heag.)Spence, William Perkins, agus Michael B. Atkins. Technical Drafting: Metric Design and Communication. Manila: National Book Store, 1980.
Lua MLA (9ú heag.)Spence, William Perkins, agus Michael B. Atkins. Technical Drafting: Metric Design and Communication. National Book Store, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.