APA (7e ed.) Bronvermelding

Modell, M. E. (1988). A professional's guide to systems analysis. McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Modell, Martin E. A Professional's Guide to Systems Analysis. New York: McGraw-Hill, 1988.

MLA (9e ed.) Bronvermelding

Modell, Martin E. A Professional's Guide to Systems Analysis. McGraw-Hill, 1988.