Brihat Parashara Hora Shastra
भूतैकविंशगिरयो नवदिक्षोडशाब्धयः । सूर्यादीनां दशाब्धाः स्यू राशीनां स्वामिनो वशात् ॥ ८४॥
Maharishi Parashar said. 5, 21, 7, 9, 10, 16 and 4 years are the Dasha spans of Sūrya, Candr, Mangal, Budh, Guru, Śukr and Śani.
english translation
bhUtaikaviMzagirayo navadikSoDazAbdhayaH । sUryAdInAM dazAbdhAH syU rAzInAM svAmino vazAt ॥ 84॥
hk transliteration by Sanscript