Best, John W.
Pearson, 2014
Buku Teks
Best, John W., author
Prentice Hall of India, 1982
Buku Teks
Best, John W., author
Prentice-Hall, 1977
Buku Teks
Wiersma, William, author
Pearson/Allyn and Bacon, 2005
Buku Teks
Bander, Edward J., author
Balinger, 1978
Buku Teks