Muhs, Karl
Duncker & Humblot, 1954
Buku Teks
Huyghe, Rene, author
Weatherhill, 2007
Buku Teks
Abdullah Muhammad Taqy Arraihan, author
2015
UI - Skripsi (Membership)
Krutch, Joseph Wood, author
Greenwood Press, 1979
Buku Teks
edited by, Alvin Toffler
Random House, 1972
Buku Teks