Mannheim, Hermann
Routledge & Kegan Paul, 1973
Buku Teks
Velikoretsky, A.
Foreign Languages Publishing House, [Date of publication not identified]
Buku Teks SO
Nekrasov, B.
Peace, 1965
Buku Teks SO
Ford, William W.
W.B. Saunders, 1927
Buku Teks
Richardson, E.G.
EKBS, 1963
Buku Teks SO