Cita APA

Schaffir, K. H., & George, T. H. (1973). Marketing information systems. American management association.

Citación estilo Chicago

Schaffir, Kurt H., y Trentin H. George. Marketing Information Systems. USA: American management association, 1973.

Cita MLA

Schaffir, Kurt H., y Trentin H. George. Marketing Information Systems. American management association, 1973.