Wriggins, W. Howard
Princeton University Press, 1960
Buku Teks
Wainwright, W. Howard
Hutchinson Technical Education , 1963
Buku Teks
Howard, W. Jeffery
Cambridge Strategy, [date of publication not identified]
Buku Teks
Academic Press, 2013
eBooks
Erlbaum Associates, 2005
Buku Teks