A third-party source (as opposed to first-party source or second-party source) is independent of the first party and second party in a transaction, interview, or written description (etc.). A first-party source comes directly from the first party (such as a self-published document or product description). A second-party source is controlled by the second party, such as a customer who has written some product requirements, or a prior book or article written by the same author.
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