Block, Marilyn R.
American Society for Quality, 1999
Buku Teks
Kennedy, Mitchell L.
John Wiley & Sons, 1998
Buku Teks
Widya Savitri, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2012
UI - Skripsi Open
Kuhre, W. Lee, 1947-, author
Prentice-Hall, 1995
Buku Teks
Kuhre, W. Lee, 1947-, author
Prentice-Hall, 1996
Buku Teks