Brihat Parashara Hora Shastra
मेषेऽर्कांशास्तु भौमस्य त्रिकोणमपरे स्वभम्। उच्चं बुधस्य कन्यायामुक्तं पञ्चदशांशकाः॥ ५२॥
Mangal has the first 12 degrees in Mesh, as Mooltrikon with the rest therein becoming simply his own Bhava. For Budh, in Kanya the first 15 degrees are exaltation zone, the next 5 degrees Mooltrikon and the last 10 degrees are own Bhava.
english translation
meSe'rkAMzAstu bhaumasya trikoNamapare svabham। uccaM budhasya kanyAyAmuktaM paJcadazAMzakAH॥ 52॥
hk transliteration by Sanscript