In the sciences, a primary source describes original research, while a secondary source analyzes or comments on a primary source or sources. For example, a research article is primary literature because it describes an original experiment and its results, while a review article is secondary literature because it collates multiple research articles to describe the current state of the field. A tertiary source is an index or consolidation of primary and secondary sources.
Examples of primary sources:
Examples of secondary sources:
Examples of tertiary sources:
The term Open Access, also known as OA, refers to the free and unrestricted online access to and publication of research such as journal articles and books. This type of content is open to everyone with no access restrictions or fees. The resources listed below provide links to OA databases relating to Botany and Plant Biology and more generally, science subjects. Each resource gives a general description of the resource including research areas and topics, publisher and publication date ranges.