Boeyink, David E. 1990. Anonymous Sources in News Stories: Justifying Exceptions and Limiting Abuses. Journal of Mass Media Ethics 5(4): 233–46.
Abstract: As discussion intensifies, and critics exploit what they see as a serious press abuse of anonymous sources, this article explores current practices and policies, as well as examines justification for and danger of anonymous source usage. Seven guidelines are listed and discussed which may help editors and reporters decide whether to use the anonymous source: editor authorization, just cause, last resort, fullest possible identification, proportionality, just intentions, and second source verification.