Sangidu
Gadjah Mada University Press , 2016
Buku Teks SO
Cambridge University Press, 2009
eBooks
Sudirman Wilian
University of Indonesia, Faculty of Humanities, 2006
Artikel Jurnal
Abdul Wahab
Airlangga University Press , 1991
Buku Teks SO
Abdul Wahab
Airlangga University Press, 1991
Buku Teks