1. THE AIMS AND TENDENCIES IN PHYSICS TEACHING
2. C. K. Wead, Aims and Methods of the Teaching of Physics, Circulars of Information of the Bureau of Education, No. 7—1884, Government Printing Office (1884), p. 117;
3. C. R. Mann, The Teaching of Physics for Purposes of General Education, Macmillan (1912), p. 58.