Those who work on research on the topic of language ideology will most likely find the following link extremely helpful:
The above link is a Google doc file that contains a chronological bibliography for research on language ideologies, compiled by researchers in this field. If you’re interested in contributing, please do so. If you’re looking for sources, this file is a great start.
The above resource is promoted by the research community interest group Language Policy and Planning, and Language Revitalization around the World.