In my 5/16/13 post I mention consulting subject experts. Workplace expertise comes as much from experience as it does from other means. The Framework acknowledges life experience as one basis of authority (Association of College & Research Libraries, 2016, Authority is Constructed and Contextual section).
Of course we develop expertise through professional reading as well. The 5/16/13 post also touches upon this issue. The Framework specifically mentions the work setting and formats appropriate to it (ACRL, 2016, Information Creation as a Process section).
Reference
Association of College & Research Libraries. (2016). Framework for information literacy for higher education. Retrieved from ACRL
website: http://www.ala.org/acrl/standards/ilframework