Kebede-Francis, Enku, author
Jones & Bartlett learning, 2011
Buku Teks
editor, John A. Talent
Springer, 2012
eBooks
Shelley McKeown; Reeshma Haji; Neil Ferguson, editor
Springer, 2016
Buku Teks
Pearce, Robert
Butterworth, 1998
Buku Teks
[publisher not identified], [date of publication not identified]
Buku Teks