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The three Greek philosophers were:
Carneades ex Academia (Cyrene 214/3–129/8 BC), Critolaus Peripateticus (Phaselis c.200-c.118 BC) and Diogenes Stoicus (Seleucia c.230 – c. 150/140 BC).
Some sources are listed in Wiki:
Plutarch, Cato Maj. 22; Aulus Gellius, VII. 14; Macrobius Saturnalia i. 5; Cicero, de Orat. ii. 37, 38.