SB 12.7.6

adhīyanta vyāsa-śiṣyāt
 saṁhitāṁ mat-pitur mukhāt
ekaikām aham eteṣāṁ
 śiṣyaḥ sarvāḥ samadhyagām
adhīyanta — they have learned; vyāsa-śiṣyāt — from the disciple of Vyāsadeva (Romaharṣaṇa); saṁhitām — the collection of the Purāṇas; mat-pituḥ — of my father; mukhāt — from the mouth; eka-ekām — each learning one portion; aham — I; eteṣām — of these; śiṣyaḥ — the disciple; sarvāḥ — all the collections; samadhyagām — I have thoroughly learned.
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.