Vyasji

Besides declaring Vyasji as authoritative, Bhagwan Swaminarayan has praised him in eleven Vachanamruts : In the Shikshapatri (93-95), the code of conduct written by Bhagwan Swaminarayan, He lists eight shastras as authoritative:-

(1) Four Vedas
(2) Vedant Sutras (Brahma Sutras)
(3) Vasudev Mahatmya of the Skand Puran
(4) Shrimad Bhagwatam
(5) Vidurniti in the Mahabharat (Udyog Parva 33- 40)
(6) Vishnusahastranam in the Mahabharat
(7) Bhagvad Gita in the Mahabharat
(8) Yagnavalkya Smruti

Of these eight, the first seven are all by Vyasji !