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Bluebook Rule (21st): 18
In general, the Bluebook requires citation to traditional printed sources when available. However, in several instances, the Bluebook permits citation to the digital copy, either directly or as a parallel citation.
General Rules for citing electronic documents
Bluebook Rule (21st): 18.2.1
Below are some general guidelines for citing electronic media in Bluebook format:
Direct Citations to Internet Sources
Bluebook Rule (21st): 18.2.2
Citation to commercial electronic databases
Bluebook Rule (21st): 18.3