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Dyfyniad Arddull ChicagoProgram Planning and Evaluation for Blind and Visually Impaired Students: National Guidelines for Educational Excellence. New York: American Foundation for Blind, 1989.
Dyfyniad MLAProgram Planning and Evaluation for Blind and Visually Impaired Students: National Guidelines for Educational Excellence. New York: American Foundation for Blind, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.