As you conduct research, you will consult different sources of information. A professor may request primary, secondary, or tertiary sources. What does that mean? This guide explains the terms and gives examples of some primary, secondary and tertiary sources.
Primary sources are original materials. They are from the time period involved and have not been filtered through interpretation or evaluation. Primary sources are original materials on which other research is based. They are usually the first formal appearance of results in physical, print or electronic format. They present original thinking, report a discovery, or share new information. The definition of a primary source may vary depending upon the discipline or context.
Secondary sources are less easily defined than primary sources. Generally, they are accounts written after the fact with the benefit of hindsight. They are interpretations and evaluations of primary sources. Secondary sources are not evidence, but rather commentary on and discussion of evidence.
Tertiary sources consist of information which is a distillation and collection of primary and secondary sources.