I've just by chance discovered that Ethan Winer's marvellous
Basic Techniques and Utilities, which I lovingly re-read many times in the early 1990s, has been released in a free 2019 digital edition. (It's a 520-page free download.)
It's mostly QuickBASIC 4.5, with quite a bit of Microsoft Basic Professional Development System 7.1 thrown in, where there are differences between the two.
Here's the link:
https://ethanwiner.com/BTU_BOOK.PDFMalcolm