selected and edited by Ermest B. Harper and Arthur Dunham
Association Press, 1966
Buku Teks
Beneficial Management Institute, [Date of publication not identified]
Buku Teks
Lenin, Vladimir I.
Foreign Languages Publishing House, 1952
Buku Teks
Hall, Livingston
West Publishing, 1965
Buku Teks
edited by Fred McKinney
Macmillan, 1967
Buku Teks