Springer, 2012
eBooks
Schaefer-Prokop, Cornelia
Thieme, 2011
Buku Teks SO
Aryono Djuned Pusponegoro
Sagung Seto, 2019
Buku Teks SO
Mateer, James R.
McGraw-Hill, 2008
Buku Teks SO
Roger Humphries, Dorian Drigalla, Maria Stephan C. Keith Stone, editors
McGraw-Hill Education, 2015
Buku Teks SO