Joel Dean. Managerial Economics. Englewood Cliffs (New Jersey): Prentice Hall 1951, s. 490.
46
Eckhard Kucher. Scannerdaten und Preissensitivität bei Konsumgütern. Wiesbaden: Gabler 1985, s. 40.
47
Eric T. Anderson and Duncan I. Simester. “Effects of $9 Price Endings on Retail Sales, Evidence from Field Experiments”. Quantitative Marketing and Economics 2003, Nr. 1, s. 93–110.