You can use SuperSearch to find biblical commentaries in the library and online. Put in search terms in the search box like:
bibl* AND commentary
(the * at the end of the first word is a wildcard and can find in this case bible OR biblical!)
or
Luke AND commentary
You can even look for more than one book at a time like this:
(Genesis OR Revelations) AND commentary
Don't forget, you can narrow your search by date to find more recent works!