Spence, W. P. (1973). Drafting technology and practice. Peoria, ILL : Bennett.
Cita Chicago Style (17a ed.)Spence, William Perkins. Drafting Technology and Practice. Peoria, ILL : Bennett, 1973.
Cita MLA (9a ed.)Spence, William Perkins. Drafting Technology and Practice. Peoria, ILL : Bennett, 1973.
Precaución: Estas citas no son 100% exactas.