Pyzdek, Thomas
The Six sigma handbook : a complete guide for green belts, black belts, and managers at all levels
McGraw-Hill, 2003
Buku Referensi
The characteristic of green belts land-use regulations in seoul metropolitan areas
Artikel Jurnal
The six sigma black belt handbook
Tom McCarty..[et.al]
McGraw-Hill, 2005
Buku Teks
Perneder, Raimund
Handbook timing belts: principles, calculations, applications
[, Springer], 2012
eBooks
Cooke, Antony
Dark nebulae, dark lanes, and dust belts
Springer, 2012
eBooks