Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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