: The UNESCO Digital Library provides detailed bibliographic information for the 1970 edition, and Open Library tracks various editions (1980, 1986).
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: Farrant observes that teaching and learning are "opposite sides of the same coin," meaning that for teaching to be considered successful, an observable change must occur in the learner. : The UNESCO Digital Library provides detailed bibliographic
: Houses bibliographical details and collation for the 1970 edition. : Houses bibliographical details and collation for the