Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 6
Sanskrit:
अधीयन्त व्यासशिष्यात् संहितां मत्पितुर्मुखात् ।एकैकामहमेतेषां शिष्य: सर्वा: समध्यगाम् ॥ ६ ॥
ITRANS:
adhīyanta vyāsa-śiṣyātsaṁhitāṁ mat-pitur mukhātekaikām aham eteṣāṁśiṣyaḥ sarvāḥ samadhyagām
Translation:
Each of them studied one of the six anthologies of the Purāṇas from my father, Romaharṣaṇa, who was a disciple of Śrīla Vyāsadeva. I became the disciple of these six authorities and thoroughly learned all their presentations of Purāṇic wisdom.