Referencing is a practice of acknowledging other peoples works, ideas, sources used in a paper, assignment, report and conference papers in academic writing. Direct quotations, facts and figures, tables and images, from published as well as unpublished works need to be referenced, as do ideas and theories that originate elsewhere
A referencing style refers to the way in which details about a reference are written down. There is no universal style: every discipline and journal has its preferred style.
Medical sciences tend to use the Vancouver or APA style. Guides to these styles are presented below.
American Psychological Association (APA) style is an academic format specified in The Publication Manual of the American Psychological Association, a style guide that offers academic authors guidance on various subjects for the submission of papers to the publications of APA.