Schuman, Frederick L.
Alfred A. Knopf, 1949
Buku Teks
Progress , 1967
Buku Teks
edited by Robbin F. Laird and Erik P. Hoffman
Aldine de Gruyter, 1986
Buku Teks
Foreign Languages Publishing House, 1962
Buku Teks
edited by Egbert Jahn
St Martin's Press, 1978
Buku Teks