Cita APA

Friendly, M., & Friendly, M. (1991). SAS system for statistical graphics (1. edition.). U.S.A.: SAS Institute.

Citación estilo Chicago

Friendly, Michael, y Michael Friendly. SAS System for Statistical Graphics. 1. edition. U.S.A.: SAS Institute, 1991.

Cita MLA

Friendly, Michael, y Michael Friendly. SAS System for Statistical Graphics. 1. edition. U.S.A.: SAS Institute, 1991.

Precaución: Estas citas no son 100% exactas.