For a guide as to what books make up a useful circumnavigators cruising library, see this list by SY Totem - Books for Cruisers.
Listings and reviews of regional and individual country cruising guides are listed under Publications on each Country page. The only guides listed in this section are those that cover a very large area and number of countries, but are not world cruising guides (see above).
Some of the recommended field guides below have been recommended by SV Totem. See their full blog post about the field guides they use on board at What are the best field guides for cruisers?