The following list of books are useful for yacht crew or people who are interested in getting into the yacht crewing industry:
What Every New Yacht Stewardess Should Know!
The Insiders' Guide to Becoming a Yacht Stewardess
Working on Yachts & Superyachts
Born to Sail On Other People's Boats
Born to Sail On Other People's Boats By Jennifer P. Stuart
World Cruising Routes
World Cruising Routes by Jimmy Cornell — this book gives an idea where yachts will be at different times of the year.
The Seagoing Hitchhiker's Handbook: Roaming the Earth on Other People's Yachts
The Hitch-hiker's Guide to the Oceans: Crewing Around the World
The Hitch-hiker's Guide to the Oceans: Crewing Around the World by Alison Muir Bennett