Cita APA (7th ed.)

Richards, L. E. (1983). Business statistics: Why and when (2nd ed.). McGraw - Hill.

Cita Chicago (17th ed.)

Richards, Larry E. Business Statistics: Why and When. 2nd ed. New York: McGraw - Hill, 1983.

Cita MLA (9th ed.)

Richards, Larry E. Business Statistics: Why and When. 2nd ed. McGraw - Hill, 1983.