Mercks Vet Manual is good.
Besides Storey's as Callieslamb said....
More books..
Managing Your Ewe and Her Newborn Lambs by
Laura Lawson
Lamb Problems: Detecting, Diagnosing, Treating by
Laura Lawson
Sheep and Goat Medicine, 2e by
D. G. Pugh DVM MS
The Sheep Keeper's Veterinary Handbook by
Agnes Winter
Sheep Book: Handbook For The Modern Shepherd, Revised & Updated by
Ronald B Parker
Sheep Farming for Meat and Wool (Landlinks Press) by
Jane Court
Raising Sheep the Modern Way . Updated and Revised Edition by
Paula Simmons
Living with Sheep: Everything You Need to Know to Raise Your Own Flock by
Chuck Wooster
Hope this helps.