Schuster, Frederick E., author
Reston, 1985
Buku Teks
edited by Donna Coch, Kurt W. Fischer, Geraldine Dawson
Guilford Press, 2007
Buku Teks
Hasenfeld, Yeheskel, author
The University of Michigan Press, 1977
Buku Teks
Smith, Alfred G.
Holt, Rinehart and Winston, 1966
Buku Teks
Lefrancois, Guy R., author
Wadsworth, 2012
Buku Teks