Grigoryan, L., author
Progress Publishers, 1971
Buku Teks
edited by P.S. Romashkin
Foreign Laguage Publishing House, 1976
Buku Teks
Pentony, Devere E.
Chandler Pub. Co., 1962
Buku Teks
McCauley, Martin
Longman, 1993
Buku Teks
edited by Kinya Niiseki
Westview Press, 1987
Buku Teks