Holmes, Martin
Westview Press, 1985
Buku Teks
edited by Guy Neave, Frans A van Vught
Pergamon Press, 1994
Buku Teks
Smith, Thomas C., author
Stanford University Press, 1955
Buku Teks
Cohen, John
George Allen and Unwin, 1958
Buku Teks
Kenneth M. Hargreaves, Stephen Cohen, editors; Louis H. Berman, web editor
Elsevier, 2016
Buku Teks