Harms, T., Clifford, R. M., & Cryer, D. (2005). Early childhood environment rating scale (Rev. ed., updated.). Teachers College, Columbia University..
Lua i Stíl Chicago (17ú heag.)Harms, Thelma, Richard M. Clifford, agus Debby Cryer. Early Childhood Environment Rating Scale. Rev. ed., updated. New York: Teachers College, Columbia University., 2005.
Lua MLA (8ú heag.)Harms, Thelma, et al. Early Childhood Environment Rating Scale. Rev. ed., updated. Teachers College, Columbia University., 2005.
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