APA (7th ed.) Zitazioa
Spence , W. P. (1980). Drafting: Technology and practice. Bennett publishing.
Chicago Style (17th ed.) Zitazioa
Spence , William P. Drafting: Technology and Practice. Peoria: Bennett publishing, 1980.
MLA (9th ed.) Zitazioa
Spence , William P. Drafting: Technology and Practice. Bennett publishing, 1980.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.