Wikipedia is a curious 21st-century phenomenon. It is crowd-sourced, and therefore fallible. It has virtually replaced physical encyclopedias. It is editable by anyone, and therefore highly variable. I admire all the contributions that have been made to it by well-meaning, knowledgeable people. I enjoy fixing things and cleaning things up. I also enjoy doing research, and finding and verifying facts.
Useful links
editWikipedia:Tutorial/Citing sources
Help:Referencing for beginners
Wikipedia:Citing sources/Further considerations
Help:Introduction to referencing with Wiki Markup
Wikipedia:Identifying reliable sources
Wikipedia:So you made a userspace draft