Do you have something more specific in mind? It would take a good size book to even begin to cover the subject without more specifics. Lots of information relating to apomixis propagation of a particular type of crop (potatoes, for instance) can be found by googling the term apomixis along with the name of the particular crop. Potatoes turned up 59,100 hits. I'm sure some are unrelated (I didn't actually look at but the first few), but there's plenty of info out there.