Owner earnings include reported earnings plus depreciation plus amoritisation minus maintenance capex. This concept was floated by WB in his annual letter to shareholders in 1986. You can find more details by reading the letter. In fact if you are interested in what he teaches it might be a good idea to read up all his annual shareholders letters. You will be able to find them free on the web.
Regarding which books to read, you can follow the threads available on valuepickr on investment books and their reviews posted by fellow boarders.
