Goekov, B.
Foreign Languages Publishing House, 1959
Buku Teks
Tikhomirov, M.
Foreign Languages Publishing House, 1959
Buku Teks
Vernadsky, George
At The Clarendon Press, 1959
Buku Teks
Rogger, Hans, author
Longman, 1992
Buku Teks
Crummey, Robert O.
Longman, 1993
Buku Teks