I write my papers in LaTeX and always reference the same, giant .bib file for citations (natbib+bibtex or biblatex, depending on journal or document requirements).
If this is your mode of operation, how do you collaborate with those who work in Word? Do you keep a parallel Endnote/Zotero file?
Clarification The purpose is so that I can contribute my sections in MS Word; not convert colleagues to LaTeX or always be the manager of the master document as project needs often dictate that someone else (MS Word user) will be managing the master document. E.g., there are cases in which I am the only LaTeX user out of 20+ collaborators.