Natyashastra
चतुष्कलो ह्युत्तमानां मध्यानां द्विकलो भवेत् । तथा चैककलः पादो नीचानां सम्प्रकीर्तितः ॥ ११॥
The steps of superior characters should take four Kalās, those of middling characters two Kalās, and those of inferior characters only one Kalā, as is well established.
english translation
catuSkalo hyuttamAnAM madhyAnAM dvikalo bhavet । tathA caikakalaH pAdo nIcAnAM samprakIrtitaH ॥ 11॥
hk transliteration by Sanscript