Cannaday, Roger E. and Peter F. Colwell, "The Cost Approach: Appraisal Gone Wrong?" The Illinois Real Estate Letter, Winter/Spring, 1995, 1-4. IREL9-1-1
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
Colwell, Peter F., Philip J. Rushing and Kimvalyn Young, "The Rounding of Appraisal Estimates," The Illinois Real Estate Letter, Summer/Fall, 1994, 1-4. IREL8-2-1
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