I was being lazy. I should have been more specific and said:

"none of my (bought in British bookstores or borrowed from British libraries) guidebooks encourage me to tip"

or better still

"none of the guidebooks I've consulted (bought in British bookstores or borrowed from British libraries) have encouraged me to tip"


Putting 'British' in was to point out that I am unfamiliar with certain publications that might be popular in other countries.