While you will want to consult the same source and edition as the author, there are some other considerations when it comes to citing:
Editions. Bluebook Rule 15.4 states, "Always cite the latest edition of a work that supports the point under discussion, unless an earlier edition would be particularly relevant or authoritative." Authors frequently cite whatever edition their libraries have in their collections, which are frequently not the newest editions. To verify whether a newer edition of a book is available and should be cited instead, you should consult WorldCat:
Step 1: Conduct a search for the book.
Step 2: Click on "View all editions," under the title's information on the search results page to see what is there.