Strong, Anna Louise, author
New World Press, 1959
Buku Teks
Foreign Languages Press, 1959
Buku Teks
Hutheesing, Raja
Orient Longmans,, 1960
Buku Teks
edited and compiled by Wolodymyr Maksymiw
Longman, 1990
Buku Referensi
Hicks, George L., author
Cornell University Press, 1971
Buku Teks