APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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