While Kendall's revision dates to 1993, Sykes wrote the bulk of this in 1952 and in the intervening years, new discoveries and translations have made some parts of some entries inaccurate. The book is in standard, alphabetical format, with entries on deities ranging from a brief sentence to a couple of paragraphs. Their roles in myths are necessarily very briefly summarized although a number of entries on the creation legends of various cultures are more fully developed, running as long as a couple pages.

This book is best used as a launching point for further investigation. Find an entry that sparks your interest and then track down a fuller version of the myths or legends wherein they feature. Otherwise, it serves as a fair quick reference guide, but I wouldn't consider it authoritative.