Artikel Jurnal
Chopra, Sunil, 1960-, author
Prentice-Hall, 2001
Buku Teks
Christopher, Martin, author
Prentice-Hall, 2005
Buku Teks
Bowersox, Donald J., author
McGraw-Hill, 2010
Buku Teks
by Robert B. Handfield [and others]
South Western Cengage Learning, 2011
Buku Teks