Buchholz, Regene A.
Prentice-Hall, 1986
Buku Teks
Buchele, Robert B.
McGraw-Hill, 1977
Buku Teks
Butler, Henry N.
South-Western Publishing, 1987
Buku Teks
Owens, Richard N.
Homewood, Ill. Richard D. Irwin, Inc , 1958
Buku Teks
Davis, Keith, 1918-
McGraw-Hill, 1984
Buku Teks