Ferguson, John H., author
McGraw-Hill, 1947
Buku Teks
McCamy, James L., author
Alfred A. Knopf, 1952
Buku Teks
Ferguson, John H., author
McGraw-Hill, 1981
Buku Teks
Ferguson, John H., author
McGraw-Hill, 1981
Buku Teks
Epstein, Edwin M., author
Prentice-Hall, 1969
Buku Teks