Forgive me the very technical question. I am looking for a reference manager which would allow me to create custom reference types and styles. I have been using an old desktop version of Endnote for storing my bibliography for many years and now I would like to migrate to an online platform, but it seems difficult, for instance, to record modern editions of primary sources, or to use diacritics correctly. I would be grateful for any advice.
Thanks in advance and best wishes