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Donald Ary, dkk.. (2006). Introduction to Research in Education . USA: Thomson Wadsworth.

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Donald Ary, dkk.. Introduction to Research in Education. USA: Thomson Wadsworth, 2006. Text.

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Donald Ary, dkk.. Introduction to Research in Education. USA: Thomson Wadsworth, 2006. Text.

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Donald Ary, dkk.. Introduction to Research in Education. USA: Thomson Wadsworth, 2006. Print.