1. U.S. Department of Housing and Urban Development (HUD). HUD Handbook 4000.1, FHA Single Family Housing Policy Handbook. Section II.A.1.a.i(A) "Applicability." This section explicitly states that an appraisal is required for all properties to be security for an FHA-insured mortgage.
2. Massachusetts General Laws. Chapter 183: Alienation of Land. This chapter governs the transfer of real property in Massachusetts and contains no provision mandating an appraisal for a valid conveyance of title between parties.
3. Ling, D. C., & Archer, W. R. (2018). Real Estate Principles: A Value Approach (5th ed.). McGraw-Hill Education. Chapter 11, "Property and Asset Valuation," discusses the role of appraisals, noting their necessity in most mortgage lending, particularly for federally related transactions like FHA loans, but not for all property transfers.