Pigors, P. J. W., & Pigors, F. (1961). Case method in human relations: The incident process. McGraw-Hill.
Chicago (17e ed.) BronvermeldingPigors, Paul John William, en Faith Pigors. Case Method in Human Relations: The Incident Process. New York: McGraw-Hill, 1961.
MLA (9e ed.) BronvermeldingPigors, Paul John William, en Faith Pigors. Case Method in Human Relations: The Incident Process. McGraw-Hill, 1961.