edited by Steven Moorhead and Gordon Grice
Rockport Publisher, 1997
Buku Referensi
BooQs publisher data, 2010
Buku Referensi
edited by Simon Swaffield
University of Pennsylvania Press, 2002
Buku Teks SO
edited by Simon Bell, Ingrid Sarlov Herlin, Richard Stiles
Routledge, 2012
Buku Teks
Simonds, John Ormsbee
McGraw-Hill, 1961
Buku Teks