Gadourek, I.
H. E. Stenfert Kroese N. V., 1953
Buku Teks
Michal, Jan M.
Stanford Univ. Press, 1960
Buku Teks
Marek, Miroslav
UNESCO, 1970
Buku Teks
Diamond, William, author
Stevens & Sons, 1947
Buku Teks
Windsor, Philip
Columbia University Press, 1969
Buku Teks