Brihat Parashara Hora Shastra
वह्निवातादिविश्वर्क्षरेवत्यः सव्यतारकाः । एतद्दशोषुपादानामश्विन्यादौ च वीक्षयेत् ॥ ५८॥
Finally incorporate the last three Nakshatras, Purvabhadrapad, Uttarabhadrapad and Revati in the Savya Chakr. Now there will be 15 Nakshatras in the Savya and 12 Nakshatras in the Apsavya, (because for the 12 Rāśis there are 12 Padas of 3 Nakshatras, the Navāńśas). The Padas of Ashvini, Punarvasu, Hast, Mul, Purvabhadrapad, Kritika, Aslesha, Swati, Uttarashadha and Revati of the Savya should be reckoned in the same manner, as the Padas of Ashvini.
english translation
vahnivAtAdivizvarkSarevatyaH savyatArakAH । etaddazoSupAdAnAmazvinyAdau ca vIkSayet ॥ 58॥
hk transliteration by Sanscript