Ohaegbulam, Festus Ogboaja
University Press of America, 1980
Buku Teks
edited Werner Link
Preager Press, 1979
Buku Teks
Kingston, Jeff, 1957-, author
Wiley Blackwell, 2016
Buku Teks
edited by Sita Ranchod-Nilsson and Mary Ann Teitreault
Routledge , 2000
Buku Teks
Brown, Delmer M., author
Russell and Russell, 1955
Buku Teks