Cita APA (7th ed.)
Spence, W. P. (1991). Drafting: Technology and practice (3rd ed.). Glencoe/ Mcmillan/McGraw-Hill.
Cita Chicago (17th ed.)
Spence, William P. Drafting: Technology and Practice. 3rd ed. California: Glencoe/ Mcmillan/McGraw-Hill, 1991.
Cita MLA (9th ed.)
Spence, William P. Drafting: Technology and Practice. 3rd ed. Glencoe/ Mcmillan/McGraw-Hill, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.