Foreign Languages Publishing House, 1959
Buku Teks SO
Mongait, Alexander
Foreign Languages Publishing House, 1959
Buku Teks
Hammer, Darrel P.
Westview Press, 1990
Buku Teks SO
Rothstein, Andrew
Penguin Books , 1950
Buku Teks SO
Progress Publishers, 1977
Buku Teks SO