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Books like drupal pro development provide a good getting started knowledge of drupal but it does not explain any of the underlying API/frameworks.
A Drupal blible where every api/framework in the core and the api's in most popular contrib modules is explained would help students and developers dive in core more easly and start contributing.
I think not only the quality of core contributions but also contrib module would rise.
This Drupal bible would be a very boring piece of reading but after reading the "easy" books and after using drupal half a year it would be a great tool to strenghten someones drupal knowledge.
After that it could be used as reference work.