Carolyn, here is the link to his profile. If you look at the edit page, you will see that everything is still there, so no need to panic! Also on the edit page, you have several places where you put the tag: <ref> That is why nothing is showing on the view page. Here's how it works:
When you want to add a footnote, you use the <ref> tag to do it, but this is a "container" tag, meaning that it "contains" the citation that will go at the bottom, where the <references /> tag appears under the == Sources == heading.
Since it is a container, you must indicate what it contains … so you have to use a start tag and end tag with the citation between them. It should look like this:
<ref> … citation goes in here … </ref>
When you place a start tag - the <ref> - then everything between it and the end tag - the </ref> will not be displayed there, but will be shown wherever the <references /> tag is.
You put several start tags in there, but did not put any end tags … the result is that the computer thinks everything after the first start tag is part of the citation and, since you never placed any end tag, the rest of the regular text never got displayed and, on top of that, there was no completed "contained" text to be displayed either, so it does not appear under the Sources heading either.
If this isn't making enough sense to you, please let me know and I'll give you a detailed step-by-step on how to do it correctly.