Logik: Perbezaan antara semakan

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<ref name="achievement">E.g., Kline (1972, p.53) wrote "A major achievement of Aristotle was the founding of the science of logic".</ref>

<ref name="Advances in Argumentation Theory and Research">{{cite book | editor1-first = J. Robert | editor1-last = Cox | editor2-first = Charles Arthur | editor2-last = Willard | editor2-link = Charles Arthur Willard | title = Advances in Argumentation Theory and Research | publisher = [[Southern Illinois University Press]] | year = 1983 | isbn = 978-0-8093-1050-0}}</ref>-->