The following have been added to the Zotero Group for Ancient World Open Bibliographies and the Ancient World Open Bibliographies Wiki.
Sophocles: Select Bibliography
Ann Raia, Dept. of Modern and Classical Languages, College of New Rochelle
No last update date; latest work is 2004.
This is a select bibliography of scholarly works in English, largely monographs.
Diotima at Stoa.org.
Last updated 2004.
Short select bibliography on Sophocles with reference to women and gender studies, includes monographs and articles, largely in English.
I have also seen many links to a bibliography of Sophocles by the late Eugene Cotter, but the links are no longer working and I have not been able to find a working link for this bibliography. If any reader has it cached or downloaded I would appreciate a tip!