Vasudevan, Alexander
Wiley Blackwell, 2015
Buku Teks SO
editor, Wolfgang Kruse
Press and Information Office of Land Berlin, 1979
Buku Teks SO
Gray, John
HarperCollins , 1995
Buku Teks SO
Sonnevend, Julia
Oxford University Press, 2016
eBooks
Danisa Agustriani
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2018
UI - Makalah dan Kertas Kerja