The following have been added to the Zotero Group for Ancient World Open Bibliographies and the Ancient World Open Bibliographies Wiki.
An introductory bibliography for Ancient Numismatics
Unattributed, Department of Coins and Medals, Fitzwilliam Museum, Cambridge.
No last update date; latest item is 1997.
A short list of general resources, and resources on Greek and Roman numismatics, mostly books in English.
Coinage of Greece & Rome – Bibliography
Unattributed, Classics and Ancient History, University of Warwick.
Last updated November 30, 2010.
Introductory bibliography, mostly in English, with sections on catalogs and reference works, monographs, and journal articles.
DONUM: Database of Numismatic Materials
American Numismatic Society.
This is the library catalog of the ANS library, which is freely searchable by the public. The library also regularly publishes recent acquisitions lists, available at http://numismatics.org/Library/RecentAcquisitions and ANS publishes an annotated bibliography on coinage, Numismatic Literature, some volumes of which are available online: http://numismatics.org/Numlit/Numlit