Sund, R. B., & Trowbridge, L. W. (1974). Student-centered teaching in the secondary school. Merrill.
Chicago Style (17. basım) AtıfSund, Robert B., ve Leslie W. Trowbridge. Student-centered Teaching in the Secondary School. Columbus, Ohio: Merrill, 1974.
MLA (8th ed.) AtıfSund, Robert B., ve Leslie W. Trowbridge. Student-centered Teaching in the Secondary School. Merrill, 1974.
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