APA-referens (7:e uppl.)

Ardales, V. B. (2008). Logic towards critical thinking and reasoning (3rd ed.). Educational Pub. House.

Chicago-referens (17:e uppl.)

Ardales, Venancio B. Logic Towards Critical Thinking and Reasoning. 3rd ed. Manila: Educational Pub. House, 2008.

MLA-referens (9:e uppl.)

Ardales, Venancio B. Logic Towards Critical Thinking and Reasoning. 3rd ed. Educational Pub. House, 2008.