Dyfyniad APA

Walton, D. N. (2008). Informal logic: A pragmatic approach (2nd ed.). Cambridge University Press.

Dyfyniad Arddull Chicago

Walton, Douglas N. Informal Logic: A Pragmatic Approach. 2nd ed. Cambridge ; New York: Cambridge University Press, 2008.

Dyfyniad MLA

Walton, Douglas N. Informal Logic: A Pragmatic Approach. 2nd ed. Cambridge University Press, 2008.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.