Logic (Revised ed.). Cambridge, MA: Harvard University Press. ISBN 0-674-55451-5. External links[edit] Stanford Encyclopedia of Philosophy entry on quotation Categories: Formal languages Navigation menu Not logged inTalkContributionsCreate accountLog inArticleTalkReadEditView historySearch Search Wikipedia Go Main page Contents Featured content Current events Random article Donate to Wikipedia Wikipedia store Interaction Help About Wikipedia Community portal Recent changes Contact page Tools What links here Related changes Upload file Special pages Permanent link Page information Wikidata item Cite this page Print/export Create a book Download as PDF Wikipedia:Zitate Abkürzung: WP:Z, WP:ZIT