d`Alpuget, Blanche
Aurora Press, 1980
Buku Teks
Freiman, Marcelle
Island, 1951
Buku Teks
Williams, Duncan
Delta Book , 1971
Buku Teks
Helga Rainer, Alison White, Annette Lanjouw, editor of compilation
Cambridge University Press, 2014
Buku Teks
Sinaga, Tuntun
Universitas Indonesia, 1998
UI - Tesis Membership