Colwell, Peter F., "Vacancy Management IV: Quality of Real Estate Services," Illinois Real Estate Letter, Winter, 1998,10-11. IREL12-1-3
Colwell, Peter F., "A Technical Analysis of the Quality of Real Estate Services," Illinois Real Estate Letter, Winter, 1998, 12-15. IREL12-1-4
Colwell, Peter F., "Vacancy Management III: The Pitfalls of Ratios," ORER Newsletter, Spring, 1990, 14. ORERL4-2-4
Colwell, Peter F., "Vacancy Management II: An Agency Problem," ORER Newsletter, Winter, 1990, 14-15. ORERL4-1-6
Colwell, Peter F., "Vacancy Management," ORER Letter, Summer, 1989, 11. ORERL3-3-3
Colwell, Peter F. and Carolyn A. Dehring, "Vacancy Management V: Is Potential Gross Income Overstated?" Illinois Real Estate Letter, Spring, 1999, 12-13. ORERL13-2-4
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