APA (7th ed.) Zitazioa
Spence, W. P. (1991). Drafting: Technology and practice (3rd ed.). Glencoe/ Mcmillan/McGraw-Hill.
Chicago Style (17th ed.) Zitazioa
Spence, William P. Drafting: Technology and Practice. 3rd ed. California: Glencoe/ Mcmillan/McGraw-Hill, 1991.
MLA (9th ed.) Zitazioa
Spence, William P. Drafting: Technology and Practice. 3rd ed. Glencoe/ Mcmillan/McGraw-Hill, 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.