Natyashastra
एव नामेति कार्यं च कोपवाक्ये विचक्षणैः । समं साच्यनुवृत्तादि यच्च दृष्टिविकल्पितम् ॥ १६१॥
The experts should also use the mouth in conformity with the varieties of Glances such as, Sama and Sācī and the like mentioned by others.
english translation
eva nAmeti kAryaM ca kopavAkye vicakSaNaiH । samaM sAcyanuvRttAdi yacca dRSTivikalpitam ॥ 161॥
hk transliteration by Sanscript