What are your sources of books in your reading list?

Adam, I think I understand what you're asking. You want to know how I find out about new books in general and how I get a feel for which ones I want to read, right?

I have a few sources. One is friends and family members who are readers themselves and who also know my reading tastes. If someone on that short list thinks I'll really like a particular book, they're nearly always right.

Another is GoodReads, a website where I've linked with online friends who share my reading tastes. Most are from a writing website I frequent, where of course we're all readers eager to share our favorites. (And we announce our own books there but don't promote them, because that's not what it's about.)

And last, the most traditional source, the print media. I subscribe to three newspapers and among them, there are lots of book reviews in a typical week. Magazines no doubt have even more.

Of course there are also plenty of websites where people review books, usually in a particular genre. If you're a fan of thrillers, westerns, or spy novels, finding websites that review those specifically can really help you find the best ones.

I choose books from favorite authors or ones where the jacket notes interest me.

I have two friends with similar taste in fiction and we pass books between ourselves in an informal book club so that we'll have something to talk about.  We're all a little adventurous in different directions but also increasingly intolerant of badly written books.  Between us I think we do a good job of not getting too stuck in a rut.  Not this year, but in a normal year, I let  booksellers persuade me to try something new.  People who work in bookshops tend to be enthusiastic readers.  Some are duds, but mostly not.  Then there's the backlog of things I've been meaning to read to dip into, as well as review programmes, and novels referenced by authors I already admire, and lucky dips in charity shops.  That's just the fiction.  For non-fiction I'm like young Stephen on this site if only he knew how citations worked.  If something catches my interest in passing I'm down that rabbit hole like a shot, and also just about every book ever reviewed on Radio 4's "Thinking Allowed" and "In Our Time" because I really am that sad.

My main sources are bookstores and libraries. A secondary source is recommendations from friends or who have lent me the book. If I read  a particular author and like the story then I read or try to read all his/her books. I don't keep a reading list

I use this one: https://thegreatestbooks.org/

My reading list has about 2,000 books on it right now. Some of them are books written by authors I like. I'm an obsessive person. When I like an author, I'll methodically work through that author's stuff. Sometimes I come across a new title or author when reading book reviews or interviews. Sometimes I hear about something new when I'm talking to somebody about books. There are a lot of different ways to find new stuff to read. 

Could you explain what you mean by "source" and "sense"?

The books I read are found either in the library or a bookstore. 

My reading list is a list of titles that I have seen in the library or bookstore or on Goodreads or in the bibliographies of books I have read. I want to read them, but I don't yet have time to read them.

I don't have a list.  

I get a book, I read it.

I understand it, so it makes sense to me.

I don't really understand what you're trying to ask.