A document that deals with the use of diagrams. This includes not only Venn diagrams but also other types of diagram. The file first it gives an introduction to the type of diagram, then some instructions on how to use them. At the end, an example is presented.
HAWKINS, R. (n.y): System Diagram – Guidelines. Wageningen: International Centre for development oriented Research in Agriculture (ICRA) URL [Accessed: 07.07.2019]