Dore, R. (1986). Flexible rigidities. London: The Athlone Press.
Dyfyniad Arddull ChicagoDore, Ronald. Flexible Rigidities. London: The Athlone Press, 1986.
Dyfyniad MLADore, Ronald. Flexible Rigidities. London: The Athlone Press, 1986.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.