Bag. Pen. Kedutaan Bessar URSS, 1959
Buku Teks
Ivashentsov, Gleb
Allied, 1989
Buku Teks
McVey, Ruth Thomas, author
Cornell university, 1962, 1957.
Buku Teks
Weigh, Ken Shen
The Coomercial Press , 1928
Buku Teks
Dallin, David J.
Yale University Press, 1949
Buku Teks