APA

Walton D. N., . (1989). Informal logic: a handbook for critical argumentation. Cambridge: Cambridge University Press.

Chicago

Walton Douglas N, . 1989. Informal logic: a handbook for critical argumentation. Cambridge: Cambridge University Press.

Harvard

Walton D. N., . (1989). Informal logic: a handbook for critical argumentation. Cambridge: Cambridge University Press.

MLA

Walton Douglas N, . Informal logic: a handbook for critical argumentation. Cambridge: Cambridge University Press. 1989.