Manus-Hannaford, R.G., author
Macdonald, 1964
Buku Teks
Haas, Kenneth B., author
Collier/Macmillan, 1974
Buku Teks
Robinson, O. Preston
Prentice Hall Inc., 1959
Buku Teks
Greif, Edwin Charles
Prentice-Hall, 1958
Buku Teks
Norris, James S., author
Prentice-Hall, 1982
Buku Teks