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