edited by Carolyn Uhlinger Shantz and Wiliard W. Hartup
Cambridge , 1995
Buku Teks SO
Pressley, Michael
Guilford Press, 2007
Buku Teks
edited by Alison Clarke-Stewart, Judy Dunn
Cambridge University Press, 2006
Buku Teks SO
edited by Joseph D. Noshpitz
John Wiley & Sons, 1997
Buku Referensi
McDonald, Ralph E.
Mosby , 1987
Buku Teks SO