Metelsky, G.
Foreign Languages Publishing House, 1959
Buku Teks
Winchester, Simon, author
Grafton Books, 1988
Buku Teks
Vitkovich, Victor
Foreign Languages Publishing House , 1954
Buku Teks
Ma, Ho-tien
John Wiley Hopkins, 1949
Buku Teks
Vazon, Ivan
Sofia Press, 1969
Buku Teks