Endres, Kirsten W., author
Nias Press, 2011
Buku Teks
Fall, Bernard B
Frederick A.Preager, 1966
Buku Teks
Nguyen-Vien
Foreign Language Publishing House, 1956
Buku Teks
Souter, Gerry, author
Andre Deutsch, 2015
Buku Referensi
editor in chief, Stanley I. Kutler
Charles Scribner's Sons, 1996
Buku Referensi