In, Ku Kim-Marshall
Step by step Korean : through 15 action verbs.1-2
Munhwasa, 2008
 Buku Teks
Richman, Larry
Project management step-by-step
[American Management Association, ], 2002
 eBooks
Christensen, Howard B.
Statistics step by step
Hoghton Mifflin, 1977
 Buku Teks SO
Sartika Kurniali
Step by step facebook
PT Gramedia, 2009
 Buku Teks SO
Jackson, Paul
Origami : a complete step-by-step guide
Chancellor, 1994
 Buku Referensi