Primary - original content, current when created information has not yet been re-interpreted by another e.g. raw data, diary entry
Secondary - interpretation of primary resource e.g. an historical interpretation book
Tertiary - contains information from primary and secondary resources e.g. encyclopedia
Scholarly - information written by experts in the field of study, supported by research and references.
Peer-reviewed - article published in a journal that has been reviewed by subject specialists who approve the content.
Non-scholarly - information is not so much research based as reporting on current events and trends e.g. newspapers, blogs, magazines