The question of whether or not to grant a source anonymity can be a tricky one. There’s so much to consider, from the source’s safety, how precious the information at hand is, what your readers think, ...
https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!126729~!0#focus ...