Brihat Parashara Hora Shastra
चतुष्कं त्रितयं तस्मात् चतुष्कं त्रितयं पुनः । एवं स्वजन्मभं यावद् विगणय्य यथाक्रमम् ॥ १८॥
From 4 Nakshatras from Ardra commences the Dasha of Sūrya, from 3 after that begins the Dasha of Candr, 4 after that will bring the Dasha of Mangal, 3 after that the Lord of Dasha will be Budh, 4 therefrom will have Śani, as the Dasha Lord, 3 thereafter the Lord will be Guru, Rahu will be the Lord of the Dasha 4 Nakshatras after that and then Śukr will take over the lordship of the Dasha 3 Nakshatras from the last one mentioned above.
english translation
catuSkaM tritayaM tasmAt catuSkaM tritayaM punaH । evaM svajanmabhaM yAvad vigaNayya yathAkramam ॥ 18॥
hk transliteration by Sanscript