Pineno, C.J.
Addison-Wesley, 1984
Buku Teks
Cerepak, John R.
Prentice-Hall, 1987
Buku Teks
Niswonger, Clifford Rollin, 1907-
South-Western Pub., Co. , 1977
Buku Teks
Stevenson, Russell A.
Alexander Hamilton Institute, 1962
Buku Teks
Hosch, Gordon A.
Prentice-Hall, 1979
Buku Teks