Margai, Florence M., author
Earthscan , 2010
Buku Teks
edited by Pat Mahony, Christine Zmroczek
Taylor and Francis, 1997
Buku Teks
Ore, Tracy E., author
Mayfield Publishing, 2000
Buku Teks
Vazquez-Brust, Diego A., editor
Springer, 2012
eBooks
edited by Jonathan M. Harris and Neva R. Goodwin
Edward Elgar , 2003
Buku Teks