Natyashastra
चित्रे द्विमात्रा कर्तव्या वृत्तौ सा द्विगुणा स्मृता । चतुर्गुणा दक्षिणे स्यादित्येवं त्रिविधा कला ॥ ६॥
In the Citra style, there should be two Mātrās; in the Vṛtti, it is said to be twice that; and in the Dakṣiṇa, it becomes four times that. Thus, the Kalā is of three kinds.
english translation
citre dvimAtrA kartavyA vRttau sA dviguNA smRtA । caturguNA dakSiNe syAdityevaM trividhA kalA ॥ 6॥
hk transliteration by Sanscript