Meditation Differently - Phenomenological-psychological Aspects of Tibetan Buddhist (Mahamudra and sNying-thig) Practices from Original Tibetan Sources — by Herbert V. Guenther
Supplemented by a detailed commentary based on original Tibetan sources.
Engaging Buddhism - Why It Matters to Philosophy — by Jay L. Garfield
A book for those who want to extend their horizons and see how Buddhist theory articulates with contemporary philosophy.
Indo-Tibetan Classical Learning and Buddhist Phenomenology — by Jamgon Kongtrul - The Treasury of Knowledge - Volume 4
Concisely summarizing the theoretical fields of knowledge to be studied prior to the cultivation of reflection and discriminative awareness.