Halawa, Ohiao, author
Nias, 1992
Buku Referensi
Yi, Sang-gak, author
Chusubat , 2008
Buku Teks
Boerner, Peter
Hamburg Rowohlt Taschenbuch 1964
Buku Teks
Herdi Sahrasad
Freedom Foundation, [date of publication not identified]
Buku Teks
Eliot, T.S.
New York Tinehart 1948
Buku Teks