Vargas, J. S. (1972). Writing worthwhile behavioral objectives. Harper & Row.
Lua i Stíl Chicago (17ú heag.)Vargas, Julie S. Writing Worthwhile Behavioral Objectives. New York: Harper & Row, 1972.
Lua MLA (8ú heag.)Vargas, Julie S. Writing Worthwhile Behavioral Objectives. Harper & Row, 1972.
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