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A Frame for task-based learning
Longman, 1996
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Effective learning & teaching in modern languages
James A. Coleman; John Klapper
Routledge, 2005
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Problem - based leraning methods to enhance the students, accomplishment in teaching learning strategies subject
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Problem-based learning innovation: using problems to power learning in the 21st century / oon-Seng Tan
Thomson Learning, 2003
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