World Publishing Co, 1956
Buku Referensi
Moore, W. G.
Penguin, 1974
Buku Referensi
Black, Henry Campbell, author
West Publishing, 1990
Buku Referensi
Black, Henry Campbell, author
West Publishing, 1985
Buku Referensi
Wandelt, Ingo, author
Friedrich Ebert Stiftung (FES) Indonesia Office, 2009
Buku Referensi