Popkin, R. H. (1980). The high road to pyrrhonism. Austin Hill Press.
Dyfyniad Arddull ChicagoPopkin, Richard H. The High Road to Pyrrhonism. California: Austin Hill Press, 1980.
Dyfyniad MLAPopkin, Richard H. The High Road to Pyrrhonism. Austin Hill Press, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.