Lewis, D., & Greene, J. (1982). Thinking better (ed.). McClelland and Stewart.
Dyfyniad Arddull ChicagoLewis, David, and James Greene. Thinking Better. ed. Canada: McClelland and Stewart, 1982.
Dyfyniad MLALewis, David, and James Greene. Thinking Better. ed. McClelland and Stewart, 1982.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.