Gilbert, Erik
Africa in world history : from prehistory to the preset / Erik Gilbert
Pearson Educational, 2004
 Buku Teks
Great books of the western world : 28 Gilbert, Galileo, Harvey
Robert Maynard Hutchins, editor in chief
Encyclopaedia Britannica, Inc., 1952
 Buku Referensi
Blessed art thou among women : reflections on mary in our world today / editors, Cynthia Fox, Joshua Simon, Robert Sullivan
Macmillan, 1997
 Buku Teks
Lockley, John
Headaches / John Lockley, Karen Sullivan
Bloomsbury , 1993
 Buku Teks
Frei, Hans
Louis Henry Sullivan / Hans Frei
Artemis Verlags, 1992
 Buku Teks