A scholarly publication on the history of Quakerism since 1906. Find full text access to date via Project Muse or up until the last 3 years via Jstor. Paper copies are available in the Quaker Collection. An excellent resource!
Find dissertations on your topic via ProQuest. Many relating to Quakerism are in Special Collections as paper copies you can check out. Some records show the references separately so you can browse the bibliography easily. Some, also, list where the dissertation has been cited in other works.