Scheaffer, Richard L., author
Duxbury Press , 1995
Buku Teks
Montgomery, Douglas C., author
John Wiley & Sons, 2004
Buku Teks
Montgomery, Douglas C., author
John Wiley & Son, 2003
Multimedia
Blum, Julius R., author
W.B. Saunders, 1972
Buku Teks
Alder, Henry L., author
W H Freeman, 1968
Buku Teks