Silbermaan, Charles E., author
Random House, 1978
Buku Teks
Wright, Burton, author
W.B. Saunders, 1978
Buku Teks
Abadinsky, Howard, author
Prentice-Hall, 1979
Buku Teks
Turner, J. W. Cecil
At The University Press, 1952
Buku Teks
Alfred A. Knopf, 1974
Buku Teks