by Peter Coburn ... [et al.]
Addison-Wesley, 1985
Buku Teks
National Education Association of the United States and the American Association of School Administrators, 1958
Buku Teks
Jorgensen, Carolyn
Brandy, 1990
Buku Teks
Bell, William D.
McGraw-Hill, 1957
Buku Teks
edited by J. C. M. M Moonen, H.E. Wuite-Harmsma
North-Holland, 1984
Buku Teks