Budnick, Frank S., author
Richard D. Irwin, 1977
Buku Teks
by Len D'Innocenzo and Jack Cullen
Gemini Books, 2000
Buku Referensi
Schonberger, Richard John
Erlangga, 1988
Buku Teks
Yang, Richard
The Forum Press, 1978
Buku Teks
Ravi Anupindi ... [and others]
Prentice-Hall, 2006
Buku Teks