Primary sources present original research by those who carried it out.
Examples include research articles in scholarly journals using IMRaD format, dissertations, technical reports, and conference proceedings.
Peer-reviewed (or refereed) journals contain articles written by experts that are reviewed by other experts in the field for quality before publication. All peer-reviewed journals are scholarly but not all scholarly journals are peer-reviewed.
DOI (or Digital Object Identifier) is unique alphanumeric string assigned by Crossref to identify content and provide persistent link to its location.
UAB PREFIX = http://ezproxy3.lhl.uab.edu/login?url=
DOI PREFIX = https://doi.org/
DOI = 10.1016/j.ejmech.2006.11.010
Secondary sources summarize and synthesize information from primary sources.
Examples include review articles in scholarly journals, magazine articles, and books.
Tertiary sources digest and condense information from primary and secondary sources.
Examples include textbooks and reference works such as dictionaries, encyclopedias, and handbooks.