Wolfenden, Elmer
Institute of National Language, 1961
Buku Teks
Manuel, A. Arsenio
Manila: Filipiniana Publications, 1948
Buku Teks
Teresita V. Ramos
Southeast Asia Studies center for Asian and Pacific Studies, 1985
Buku Teks SO
Dita Putri Prameswari
Universitas Indonesia, 2011
UI - Tesis Open
London: Tiger Books International, 1994,
Buku Referensi