Murray, David, author
Routledge/Thoemmes Press, 1996
Buku Referensi
Murray, David, author
Routledge/Thoemmes Press, 1996
Buku Referensi
Lenin, Vladimir I., author
Foreign Languages Publishing House , [date of publication not identified]
Buku Teks
Parragon, 2000
Buku Referensi
Moogk, Peter N.
Antonson Publishing, 1978
Buku Teks