Darr, Kurt
The John Hopkins University Press , 1997
Buku Teks
edited by David Baker and Wendy Evans
Emerald, 2017
eBooks
Floridi, Luciano, 1964-
Oxford University Press, 2015
Buku Teks
Kinnell, Margaret
Library Association Publishing, 2001
Buku Teks
Hosmer, Larue Tone
Irwin, 1987
Buku Teks