Seth, Michael, author
University of Hawaii Press, 2002
Buku Teks
Gonzalez-Mena, Janet, author
McGraw-Hill, 2011
Buku Teks
Deane E. Neubauer, editor
Routledge, 2012
Buku Teks
African Centre for Technology Studies, 1994
Buku Teks
Navarro, Vicente
Ballinger Publ., 1994
Buku Teks