'Pevsner' is my generic term for all those wonderfully detailed books about the buildings of England, Scotland, Ireland and Wales which were originally written by Nikolaus Pevsner, the architectural historian, between 1951 and 1974. The two volumes you need for these anchorages are Argyll and Bute by Frank Arneil Walker, 1992, Penguin Books and Highlands and Islands by John Gifford, Yale University press, 2003.
The Scottish Islands Hamish Haswell-Smith, Canongate, 2nd Edition revised 2008 is the bible, albeit not by definition of the mainland of Scotland. The drawings, by the architect author, are charming and the information encyclopaedic. It is has to be on the boat really.
Scotland the Best Peter Irvine, HarperCollins, London, 2011, now in its 11th edition, is quite simply the best guide to Scotland - beaches, walks, pubs, hotels, everything. It is specific rather than sensitive as we say in the medical trade, in other words there are some good places missing but those that are mentioned are almost invariably excellent. I don't think there is anywhere in this book within reach of an anchorage that I have not mentioned. However, beware, some of the numbers on the maps do not correspond with the correct entries in the text, and some are in the wrong position - a bit of sloppy editing.