Many U.S. cases are available in Westlaw as page image format (PDFs) from the National Reporter System, including citations from:
U.S. and Canadian Supreme Court cases are available in page image format (PDFs) from Hein Online:
If not in Westlaw or Hein Online, search for court reporters in print using the Law Library catalog:
Codified law citations - Different journals have differing policies about whether a non-page image copy is acceptable. If it is, type the code citation into the appropriate search or "find by citation" box in Westlaw or Lexis. If you must have page image copies -
Session law citations - Hein Online provides page image copies, as required by some journals, for most years for most jurisdictions:
Historical code citations - in rare cases, an author may cite to a codified provision as it existed at a particular date, rather than to the current code.
Federal legislative documents (legislative history or congressional documents):
State legislative citations may be difficult to recognize, and are often difficult or impossible to track down. Don't drive yourself nuts on these - See a Reference Librarian (they're already nuts).
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