Griffiths, Arlo
UI-Press, 2010
UI - Pidato
Ali Said
Ethika , 1967
Buku Teks
Nasution, B.
Maesada, 1951
Buku Teks
Nugroho Notosusanto
[publisher not identified], [date of publication not identified]
Buku Teks
Sitorus, L. M.
Pustaka Rakjat, 1951
Buku Teks