Pigors, P. J. W., & Pigors, F. (1961). Case method in human relations: The incident process. McGraw-Hill.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিPigors, Paul John William, এবং Faith Pigors. Case Method in Human Relations: The Incident Process. New York: McGraw-Hill, 1961.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিPigors, Paul John William, এবং Faith Pigors. Case Method in Human Relations: The Incident Process. McGraw-Hill, 1961.