You can download the PDF from the official ISO website:
Or, if you're looking for a more formal citation: iso 17356-3 pdf
If you are looking to get the pdf here is the official Source You can download the PDF from the official
"ISO 17356-3:2016(E) - Road vehicles - Connectors for on-board electrical wiring harnesses - Part 3: Standard for Miniature Connectors" iso 17356-3 pdf