Owen, Terence C.
Marcel Dekker, 1969
Buku Teks
Gail A. Steehler, editor
McGraw-Hill, 2009
Buku Teks
Openshaw, H.T.
Cambridge University Press, 1962
Buku Teks
Beran, J.A., author
John Wiley & Sons, 2009
Buku Teks
Bettelheim, Frederick A., author
Harcourt Brace Jovanovich College, 1991
Buku Teks