'Rat Health Care' ( Deb Ducommun ) 
A guide for rat owners who wish to know more of ailments and their cures, alternative diets, improving husbandry and a whole host of practical tips. Available through NERS - contact Alison Campbell 

'Rats' ( Carol Himsel ) 

 'The Proper Care of Fancy Rats' ( Nick Mays )
Out of print - An excellent rat care book and a must for all rat owners considering breeding or showing. ( Pub. TFH. Price. Approx £12 if you can find it - sometimes available in Petsmart/Pets at Home )

 'Practical In-breeding' ( Watmough )
Out of print - only available from antique book shops.

'The Scuttling Gourmet: a guide to wholesome nutrition for rats' (Alison Campbell)
An excellent comprehensive guide to rat nutrition.  Available through NERS for £6.65 (incl. p&p) - contact Alison Campbell 

'The Story of Rats: their impact on us, and our impact on them' (S. Anthony Barnett)
(Pub. Allen & Unwin, 2001)

'You're never more than twenty feet from a rat: encounters, anecdotes & tales' (compiled by Michelle Lovric)
(Pub. Advanced Marketing, UK, 2004)

If you have any difficulty in obtaining a book, please ask as other rat keepers may have found sources for these books.