Somewhat credible, refer back to Hierarchy of Credibility.
Protect reputation – unlikely to publish something that is wrong.
Have to sell their products – unlikely to publish anything negative towards it.
No independent peer review of white paper. Reviewed and edited by internal personnel.
Triangulation required to rule out bias.
Do not always have named authors. Unable to cross-reference with other authors work.
Paper may not be dated, difficult to determine how up-to-date it is.
Credibility reduces with no names author(s) and/or publication date.