Brihat Parashara Hora Shastra
स एव जातकाधीशो विज्ञेयो द्विजसत्तम । यथा भूमौ प्रसिद्धोऽस्ति नराणां क्षितिपालकः ॥ ७॥
Out of these Karakas, Atma Karak is the most important and has a prime say on the native.
english translation
sa eva jAtakAdhIzo vijJeyo dvijasattama । yathA bhUmau prasiddho'sti narANAM kSitipAlakaH ॥ 7॥
hk transliteration by Sanscript