Natyashastra
हस्तौ कट्यूरुविन्यस्तौ स्वस्थे स्यादुपवेशने । पादः प्रसारितः किञ्चिदेकश्चैवासनाश्रयः ॥ २०४॥
In sitting at ease, the two hands are to be placed on the hips or thighs, and one foot is to be slightly stretched while the other rests on the seat.
english translation
hastau kaTyUruvinyastau svasthe syAdupavezane । pAdaH prasAritaH kiJcidekazcaivAsanAzrayaH ॥ 204॥
hk transliteration by Sanscript