These databases are good starting places for contemporary and some historical writing in periodicals. They tend to be wide in scope, but not necessarily deep in coverage.
These more specialized tools index journals core to the study of film and television, including more international and professional practice-focused journals and magazines.
Because of their connection to ethnography and historical information, scholarship on documentaries can often appear in anthropology and history journals.
Although more focused on the visual arts, these databases can be very helpful for identifying scholarship on video art and experimental film, animation, aesthetics, and other relevant topics.