Não informado. (1970). Planning & Changing. Illinois State University, Department of Educational Administration.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Planning & Changing. Normal, Ill: Illinois State University, Department of Educational Administration, 1970.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Planning & Changing. Illinois State University, Department of Educational Administration, 1970.
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