• THE VAAYU PURAANA - PART II Unknown ancient scholars
• THE TAITTIRIYA UPANISHAD – The Complete PDF Brihadaranyaka Upanishad and Isha Upanishad
• Katha Upanishad Unknown
• Maha Yoga or The Upanishadic Lore Sri Ramanasramam
• Mandukya Upanishad James Swartz
• From the Upanishads Ananda Wood
• Dialogues from Upanishades Sri Swami Sivanandaji Maharaj
• Brihadaranyaka Upanishad Unknown
• Mundaka Upanishad Karan Singh
• THE TAITTIRIYA UPANISHAD A. Mahadeva Sastri, B.A.
• The Ten Principal Upanishads Shree Purohit Swami and W.B.Yeats
• Brihadaranyaka Upanishad Sri Shankaracharya
• The Metaphysics of the Upanishads Vichar Sagar
• Interpreting the Upanishads Ananda Wood
• Isopanisad – Isha Upanishad Unknown
• Chhandogya Upanishad (Part1) Vimala Thakar
• An Insight On Atma Pooja Upanishad Sadhguru
• બૃહદારણ્યક ઉપનિષદ ભાગ-૨ Unknown
• બૃહદારણ્યક ઉપનિષદ ભાગ-૧ Unknown
• Upanishad Vakya Kosha - A Concordance of the Principal Upanishads and Bhagavad Gita Colonol G. A. Jacob
• Shri Sarasvatirahasya Upanishad Unknown
• Devi Upanishad Unknown