Reference SystemA spatial reference system (SRS) or coordinate reference system (CRS) is a coordinate-based local, regional or global system used to locate geographical entities.
Learn spatial reference system from Wikipedia
Harvard referencing system (also known as Parenthetical referencing) is the most common style of referencing used at Staffordshire University and is the officially adopted standard for all students except those studying Law or Psychology. The guides below are collected from some university.
correct Single reference to Harvard Style Reference form-Harvard Style Reference Generator
correct All reference to Harvard Style Reference form-Scholar software tool
APA reference style: Publication Manual of the American Psychological Association.
APA Style was first developed 80 years ago by a group of social scientists who wished to establish sound standards of communication. Since that time, it has been adopted by leaders in many fields and has been used by writers around the world.
APA's style rules and guidelines: The Publication Manual of the American Psychological Association.
I want to buy a hard cover of APA style:
