Where and why does the zaraba method have advantages over the itayose method? - comparison of the zaraba methods and the itayose method by using the U - Mart System
 Artikel Jurnal
Experimental design in industry
edited by Victor Chew
John Wiley & Sons, 1958
 Buku Teks SO
Aryuanto Soetedjo
Experimental study on lip smile detection./ Aryuanto Soetedjo
National Institute of Technology (ITN) Malang, Department of Electrical Engineering, 2011
 Artikel Jurnal
Crossby, Arch L.
Method and systems / Arch L. Crossby
Prentice-Hall, 1962
 Buku Teks
Shah, A. B.
Metodologi ilmu pengetahuan = Scientific method
Yayasan Obor Indonesia, 1986
 Buku Teks SO