Dendermonde, Max
Trap op, Trap af
EM. Querido's Uitgeverij N.V, 1967
 Buku Teks
Puzo, Mario, 1920-
Fools die : a novel / by Mario Puzo
Putnam, 1978
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Cooley, Leland Frederick
The retirement trap
Doubleday & Company, Inc, 1965
 Buku Teks
Hare, Bill
Celebration of fools: an inside look at the rise and fall of JCPenney
[American Management Association, ], 2004
 eBooks
Brown, Harold
Franchising: trap for the trusting
Littlefield Adams , 1969
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