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