Brahma Jnanavali Mala of Adi Shankaracharya
Bhagavad Gita Heart and Soul
Bhagavad Gita Chanting Guidelines wrt Panini's Ashtadhyayi
Bhagavad Gita Applied Wisdom
Bhagavad Gita
Ashtavakra Gita
Aitareya Upanishad