Custom alphabetical review page

Hi,

I’m trying to recreate the alphabetical listing of book reviews found at https://www.ooofbok.se/bokarkiv/ which is updated manually, but instead have it created by wordpress through the use of custom fields inside specific book review posts. The custom fields being author and book title and then getting the date by post date. I’m pretty sure I would be able to create the list alphabetically (although I’m pretty new at custom fields so the entire strategy would be nice) but getting them sorted under the specific letters is really stumping me.

Any help is much appreciated.