Currently, the list of books are sorted in the Wikisource reader app based on the pageviews data denoting their popularity. Books with more views are placed earlier than the books with relatively lesser views. But books can also be sorted alphabetically in addition to the default sorting option through pageviews. .
The alphabetical sorting should be made possible from the wsindex API and then the sorting option should be visible in UI.
In the sort options, there should be two ways to sort - 1) existing popularity based sort 2) alphabetical based sort. More options can come in future