25
26
Diouf, Mamadou.
| Columbia University Press |
2012
27
Hendriks, H. Jurgens
| |
2012
28
Crockett, Clayton.
| Columbia University Press |
2011
29
Miller, Barbara Day.
| The Rowman & Littlefield Publishing Group |
2010
30
Christopoulos, Menelaos
| The Rowman & Littlefield Publishing Group |
2010