Shiva Purana
तत्र सत्रं समाकर्ण्य तेषामक्लिष्टकर्मणाम् ॥ साक्षात्सत्यवतीसूनोर्वेदव्यासस्य धीमतः ॥ ६ ॥
There they heard the sacrifice and performed their duties without difficulty. He was directly the son of Satyavatī and the intelligent Vedavyāsa.
english translation
tatra satraM samAkarNya teSAmakliSTakarmaNAm ॥ sAkSAtsatyavatIsUnorvedavyAsasya dhImataH ॥ 6 ॥
hk transliteration by Sanscript