APA-referens (7:e uppl.)

Richards, L. E. (1978). Business statistics: Why and when. McGraw - Hill.

Chicago-referens (17:e uppl.)

Richards, Larry E. Business Statistics: Why and When. New York: McGraw - Hill, 1978.

MLA-referens (9:e uppl.)

Richards, Larry E. Business Statistics: Why and When. McGraw - Hill, 1978.