Butler, F. A. (1954). The improvement of teaching in secondary schools (3rd ed.). Chicago University Press.
Citace podle Chicago (17th ed.)Butler, Frank Arthur. The Improvement of Teaching in Secondary Schools. 3rd ed. Chicago: Chicago University Press, 1954.
Citace podle MLA (8th ed.)Butler, Frank Arthur. The Improvement of Teaching in Secondary Schools. 3rd ed. Chicago University Press, 1954.
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