Hart, Albert Gailord, 1909-
Prentice-Hall, 1953
Buku Teks
Simpson, Thomas D.
Prentice-Hall, 1987
Buku Teks
Cathcart, Charles D.
Richard D. Irwin, 1982
Buku Teks
Kamerschen, David R.
South-Western Publishing, 1992
Buku Teks
Stanford, Jon D.
John Wiley & Sons, 1973
Buku Teks