Belshaw, Cyril S.
Royal Institute of International Affairs, 1950
Buku Teks SO
Thurnwald, Richard, 1869-1954
Human Relations Area Files Press, 1970
Buku Teks SO
Persoon, Gerard A.
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2017
Artikel Jurnal
Verheijen, Jilis A.J.
Department of Linguistics, 1986
Buku Teks SO
Crawfurd, John
Oxford University Press, 1971
Buku Referensi