Brihat Jataka
विज्ञेया दशकेष्वब्दा ऋतुमासस्तयैव च ॥ अष्टकेष्वपि मासार्द्धास्तिथयश्च तथा स्मृता: ॥ २६-१२ ॥
Among those consisting of 10 are to be known as the years, seasons, and months. And thus among those consisting of 8 are recollected as the fortnight and tithi.
english translation
vijJeyA dazakeSvabdA RtumAsastayaiva ca ॥ aSTakeSvapi mAsArddhAstithayazca tathA smRtA: ॥ 26-12 ॥
hk transliteration by Sanscript