Juul, Svend
Texas StataCorp LP, 2014
Buku Teks SO
Becketti, Sean
Stata Press, 2013
Buku Teks SO
Ramlall, Indranarain
Emerald, 2017
eBooks
Lalanne, Christophe
ISTE Press - Elsevier , 2016
Buku Teks
Leger, A.S. St.
Open UNiversity Press, 1999
Buku Teks