I am not a fan, as it puts in scrolling-within-scrolling as others have said. I do, however, appreciate you asking! I hope you don't feel like you're at the bottom of a dogpile ;)
As Ros suggested in one of the other answer comments, consider writing in paragraphs instead of lists--it really cuts down on the length.
To put it in perspective, your sources section is currently only as long as your Born, Christening, Marriage, and Children sections. If you wrote a sentence for each (granted, the children will be a long list in a sentence), you'd save about as much space as your current source code box, but all would be visible instead of hidden in an inner scrollbox.