Fleck, George M.
Holt Rinehart and Winston, 1971
Buku Teks
Scudder, Paul H.
John Wiley & Sons, 1992
Buku Teks
Larson, Richard A.
CRC Press, 1994
Buku Teks
Kotz, John C.
Thomson, Brooks/Cole, 2006
Buku Teks
Kotz, John C.
Saunders College, 1991
Buku Teks