These are the best books i can think of, used it extensivley during my degree studies:
a) Aircraft Electrical Systems - E.H.J.Pallet
b) Aircraft Instruments and Integrated systems - E.H.J.Pallet
Easy to read and verry verry informative
hope that helps, what do you need them for may I ask?
heres a link to Amazon :
http://www.amazon.co.uk/exec/obidos/...H.J.%20Pallett
Craig
p.s
"The jet engine" by Rolls Royce is also a good investment for a no nonsense guide id rate it a
10 out of 10 for general information