Jakarta : CV. Eka Jaya, 2007,
Buku Referensi
Muller, K.A.
Berlin Knaur 1936
Buku Teks
Neuchatel : de la Baconniere
Majalah, Jurnal, Buletin
editor in chief, Mortimer J. Adler
Encyclopedia Britanica, 1990
Buku Referensi
editor in chief, Mortimer J. Adler
Encyclopedia Britanica, 1990
Buku Referensi