Answer by Suminda Sirinath S. Dharmasena for Are there any descriptions of the deathless/unborn in any tradition of Buddhism?

In Abhidhammattha Sangaha Sections on Supramundane Consciousness, Realisation of Nibbana, Rootless Consciousness, Nirodha Samapatti, Realization, Emancipation and Attainments cover aspects of Nirvana.

There are a few book which is based on this:

• Comprehensive Manual of Abhidhamma, Bhikkhu Bodhi, general editor
• Fundamental Abhidhamma, Dr. Nandamālābhivaṃsa
• Handbook of Abhidhamma Studies by Sayadaw U Sīlānanda

You can consult them for further details. Also look directly at the source, viz., The Abhidhamma Pitaka which is available for from http://abhidhamma.com/.

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