Scheaffer, Richard L., author
Duxbury Press , 1995
Buku Teks
Fleming, Michael C., author
Rouledge, 1994
Buku Teks
Levin, Richard I., author
Prentice-Hall, 1980
Buku Teks
Berenson, Mark L., author
Prentice-Hall, 1988
Buku Teks
Blum, Julius R., author
W.B. Saunders, 1972
Buku Teks