edited by Peter France
Clarendon Press, 1995
Buku Referensi
Vinogradov, N.
Peace, [date of publication not identified]
Buku Teks
Sorokin, G
Progress Publisher, 1967
Buku Teks
Wright, W., author
University Press, 1951
Buku Teks
Progress Publishers, 1977
Buku Teks