Upanishads(Upadesha prasthana (injunctive texts), and Śruti prasthāna (starting point of revelation))
The Brahma Sutras, known as Nyaya prasthana or Yukti prasthana (logical text or axiom of logic)
Gita, is Sadhana prasthana (practical text), and Smriti prasthāna (start point of remembered tradition)
All the founders of major schools of Vedanta, wrote bhāṣyas (commentaries) on above texts.
