Jensen, C. H. (1968). Engineering drawing and design. McGraw-Hill Co. of Canada.
Lua i Stíl Chicago (17ú heag.)Jensen, Cecil Howard. Engineering Drawing and Design. New York: McGraw-Hill Co. of Canada, 1968.
Lua MLA (9ú heag.)Jensen, Cecil Howard. Engineering Drawing and Design. McGraw-Hill Co. of Canada, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.