Galli, Nicholas
John Wiley & Sons, 1978
Buku Teks
by Randall R. Cottrell, James T. Girvan, Denise M. Seabert, Caile Spear, James F. McKenzie
Pearson Education, 2018
Buku Teks
Cottrell, Randall R., author
Pearson, 2014
Buku Teks SO
Black, Jill M., author
Jossey-Bass, 2010
Buku Teks
Russell, Robert D.
National Education Association, 1975
Buku Teks