Paramita R. Abdurachman, author
Lembaga Research Kebudayaan Nasional L.I.P.I, 1972
Buku Klasik
R.M. Koentjaraningrat, 1923-1999, author
Southeast Asia Program Cornell University, 1961
Buku Teks
Philippines: The Summer Institute of Linguistics, 1954
Buku Teks
Hoogervorst, Tom Gunnar, author
Faculty of Humanities University of Indonesia, 2011
Artikel Jurnal
Lugton, Robert C.
Prentice-Hall, 1978
Buku Teks SO