MacKenzie's Goat Husbandry", 5th edition, revised by Ruth Godwin. (1993) - not the earlier versions. Even in that one read cautiously the sections about Goat health, though still relevant by and large. I would not sweat over the detailed section on feed values, just go with the general gist of it.
I find the older books are good value for smallholder goats.
Avoid US books with the exception of the Belanger " Storey's guide to raising dairy goats"
Both the above should be available relatively cheaply on abebooks.co.uk
Hope this helps?