Foreign Languages Publishing House, 1957
Buku Teks
Moon, Glenn W., author
Holt, Rinehart and Winston, 1964
Buku Teks
Dixson, Robert J., author
Regents Publishing, 1959
Buku Teks
edited by Helmut Arntz
Press and Information Office of the Federal Government, 1961
Buku Teks
Foreign Languages Publishing House, 1957
Buku Teks