The best introduction to spaced repetition, Michael Nielsen's Augmenting Long-term Memory (http://augmentingcognition.com/ltm.html http://augmentingcognition.co

The best introduction to spaced repetition, Michael Nielsen's Augmenting Long-term Memory (http://augmentingcognition.com/ltm.html http://augmentingcognition.com/ltm.html), includes a detailed explanation of how to use Anki for studying books.