Classificatio Decimalis Dewey
Classificatio Decimalis Dewey (Anglice: Dewey Decimal Classification), etiam dicta Formula Decimale Dewey (Anglice: Dewey Decimal System), praecepta sunt librorum discriptionis a Melvil Dewey anno 1873 excogitata et 1876 divulgata, quae per viginti duo retractationes maiores, recentissime anno 2004, magnopere aucta et emendata est. Haec ratio libros super pluteos bibliothecarum ordinat in diserto iterantique ordine, qui hominibus expedit qualemcumque librum invenire et in loco apto restituere. Siglum sicut Dewey 16 ad sexto decimo classificationis editionem refert.

Classes 
Formula in decem praecipuis classibus vel categoriis consistit:
 000 – Scientia computatralia, informatio, opera generalia
 100 – Philosophia et psychologia 
 200 – Religio
 300 – Scientiae sociales
 400 – Linguae
 500 – Scientia et mathematica
 600 – Technologia et scientia adhibita
 700 – Artes, oblectamenta et otii 
 800 – Litterae 
 900 – Historia, geographia, biographia

Nexus externi 
 Plenus Classium Decimalium Dewey Index
 Situs Decimalis Dewey OCLC
 Index classificationis et rerum in Project Gutenberg
 "What's so great about the Dewey Decimal System?" at Straight Dope, 31 Ianuarii 2006
 Historia Classificationis Decimalis Dewey et Melvil Dewey creatoris 
 A Dewey Decimal System Tutorial by the Illinois State Library, funded by the Gates Foundation
 An annotated bibliography on Library Classification and Subject Approaches to Information by Salman Haider, Librarian (Cataloging), US Library of Congress, New Delhi Overseas Office
 https://web.archive.org/web/20090215202328/http://deweybrowse.org/ Browse to (some) sites and articles by DDC numbers

Bibliotheconomia
Inventiones Civitatum Foederatarum
Repraesentationes scientiae
Taxinomia