by UNESCO
New York Graphic Society, 1959
Buku Referensi
Wanchope, R.S.
Calcutta General Print, 1933
Buku Teks SO
Vincent, Irene Vongehr
University of Chicago, [Date of publication not identified]
Buku Teks SO
Rampa, T. Lobsang
Ballantine Books, 1973
Buku Teks SO
Zheng, Gong
New Star Press, 2009
Buku Teks