Young, Frederick H., author
John Wiley & Sons, 1968
Buku Teks
Smith, Karl J., author
Brooks/Cole, 1973
Buku Teks
Schaaf, William L., author
Collier Books, 1966
Buku Teks
Russell, Bertrand, 1872-1970, author
George Allen and Unwin, 1956
Buku Teks
Novak, David, author
D.C. Health , 1989
Buku Teks