Brihat Parashara Hora Shastra
सर्वेषामाप भावानां ज्ञेयमेवं पदं द्विज । तनुभावपदं तत्र बुधा मुख्यपदं विदुः ॥ ३॥
Similarly Padas for other Bhavas be known through their Lords. The word “Pad” exclusively denotes the Pad for Lagn.
english translation
sarveSAmApa bhAvAnAM jJeyamevaM padaM dvija । tanubhAvapadaM tatra budhA mukhyapadaM viduH ॥ 3॥
hk transliteration by Sanscript