Among the most useful primary sources for the history of a specific company are its own annual reports and other publications. The availability of online versions of these materials varies by company and often may not go back for more than a decade, so the individual company may need to be contacted for these materials (the Company Research Guide lists sources for tracking company contact information). Official corporate filings with the U.S. Securities & Exchange Commission (SEC) typically go back no earlier than 1994.
A comprehensive list of sources on business history books, as well as other sources, is provided in the Guide to Business History Resources, published by the Library of Congress. Many of these sources will need to be ordered through ILLiad. The sources listed below either are in the Tufts collection or are available online.
Business history is embedded in a range of other types of resources: