Is it me or is it incredibly difficult to find resources on the 4 (or 8, with the arupas) jhānas and how to reach them in the mahāyāna/vajrayāna literature? Apart from vague references to samādhi in general, I can't find anything.
Edit: In addition to the suttas, theravādins also have commentaries and books on jhānas, for example the one by Ajahn Brahm... I was looking for a mahāyāna equivalent, too bad :(
Edit 2: I've found my happiness: https://www.amazon.com/dp/1559393254