Cita APA (7a ed.)
Smith, L. R. (1990). Basic english for business and technical careers (1¦ ed.). [s.n.].
Cita Chicago Style (17a ed.)
Smith, Leila R. Basic English for Business and Technical Careers. 1¦ ed. México, D. F.: [s.n.], 1990.
Cita MLA (9a ed.)
Smith, Leila R. Basic English for Business and Technical Careers. 1¦ ed. [s.n.], 1990.
Precaución: Estas citas no son 100% exactas.