Seychelles by Sarah Carpin and Paul Turcotte — A photographic guide to the islands covering the main destinations, wildlife, and culture. Good for getting oriented before you arrive.
Lonely Planet Mauritius, Reunion and Seychelles — The standard practical guide. Useful for logistics, though it can be heavy on accommodation listings.
Africa's Top Wildlife Countries by Mark W. Nolting — Covers Seychelles in the context of East and southern Africa wildlife travel. Handy if Seychelles is part of a wider trip.
Amphibians and Reptiles of Madagascar, the Mascarenes, the Seychelles, and the Comoros Islands by Henkel and Schmidt — A specialist field guide for the region's remarkable reptile fauna, including the giant Aldabra tortoises.