Natyashastra
वक्षसो वार्षगण्ये तु शिरश्छेद्यन्तु कैशिके । एभिः प्रयोक्तृभिर्न्यायैर्नानाचारीसमुत्थितैः ॥ ७४॥
In the Vārṣagaṇya [Nyāya], the strike should be at the chest, and in the Kaiśika [Nyāya], at the head. These Nyāyas, arising from various Cārīs, should be used by performers.
english translation
vakSaso vArSagaNye tu zirazchedyantu kaizike । ebhiH prayoktRbhirnyAyairnAnAcArIsamutthitaiH ॥ 74॥
hk transliteration by Sanscript