Hi! First of all, thank you for your edits! I'm very happy to see new people around here ^^
I've noticed that you are adding references manually (just typing the citation contents in), but we have a method to format them in a "prettier" way. Most pages don't use it yet (it's relatively new) but is very easy to use. Instead of typing the whole thing, just click the Cite button on the toolbar and enter the ISBN (or DOI and similar identifiers) in the pop-up that will appear. This should in theory generate a formatted reference that you can insert directly if you click the blue Insert button. Just a little pro-tip!
Thank you again, and let me know if I can help you with anything!