NOTE: According to the APA, MLA, Turabian, and Chicago style guides, dictionaries, encyclopedias, and concordances are all treated as reference works.
So, if you are trying to cite a dictionary from the web, for example, but the sample entries provided do not answer your question(s) completely, look at the examples for web encyclopedias and concordances for additional guidance.
View these pages to see some of the most common examples, including some print, database, and web sources:
Print Examples -- Dictionary, Encyclopedia, & Concordance
Database Examples -- Dictionary & Encyclopedia
Web Examples-- Dictionary, Encyclopedia, & Concordance