Natyashastra
सन्निपातस्ततः शम्या तालः शम्यामथापि वा । सन्निपातादिको ज्ञेयः शम्यादिश्च तथापरः ॥ १२॥
Then comes Sannipāta, followed by Śamyā, Tāla, and again Śamyā; or alternatively, Śamyā, Tāla, Śamyā, Tāla. These are to be known respectively as Sannipātādi and Śamyādi types.
english translation
sannipAtastataH zamyA tAlaH zamyAmathApi vA । sannipAtAdiko jJeyaH zamyAdizca tathAparaH ॥ 12॥
hk transliteration by Sanscript