Pletz, J. S. (2010). Finding and confirming truth. University Press of America.
Dyfyniad Arddull ChicagoPletz, John S. Finding and Confirming Truth. Lanham, Md.: University Press of America, 2010.
Dyfyniad MLAPletz, John S. Finding and Confirming Truth. University Press of America, 2010.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.