APA (7e ed.) Bronvermelding

FREUD, J. E. (1977). Elementary Businisess Statistics The Modern Approach John E. Freud Dan Frank J. Williams. Prentice-Hall International.

Chicago (17e ed.) Bronvermelding

FREUD, John E. Elementary Businisess Statistics The Modern Approach John E. Freud Dan Frank J. Williams. Prentice-Hall International, 1977.

MLA (8e ed.) Bronvermelding

FREUD, John E. Elementary Businisess Statistics The Modern Approach John E. Freud Dan Frank J. Williams. Prentice-Hall International, 1977.