The diagram provides a rough sketch of the path of health/science related information developing from ' an idea' to an 'established part' of the scientific literature. Information is published over time, from 'primary' to 'secondary' to 'tertiary' sources.
Courtesy: Univ. of Waterloo Library
Also see: UCLA Library
Prof. Bazely & Prof. Vicari's article (Primary research article being discussed in News & Social media)
in Science News
Book: Fungal Associations