Every book, article, inscription and object the outlines lean on, in one place. Sort it by author, by theme, or by which outline cites it. Where a book can be bought, the link is here and nowhere else on the site — so the disclosure at the foot of this page is the only one you need to read.
As an Amazon Associate I earn from qualifying purchases. The “Find it on Amazon” links on this page are paid links, and they are the only paid links anywhere on this site. Nothing in the outlines themselves links to a shop: a footnote that names a book sends you here first, so that you meet this notice before you meet the price. Listing a book is not an endorsement of it — several are here to be argued with.