Brihat Jataka
पापा बलिन: स्वभागगा: पारक्ये विबलाश्च शोभना: ॥ लग्नं च वियोनिसंज्ञकं दृष्ट्रवात्रापि वियोनिमादिशेत् ॥ ३-२ ॥
If in the birth chart the malefic planets are strong and occupy their own navamshas and the benefic are on the contrary, weak and occupying navamshas other than their own, and the ascendant sign is non human, even then the birth should be declared as non-human.
english translation
pApA balina: svabhAgagA: pArakye vibalAzca zobhanA: ॥ lagnaM ca viyonisaMjJakaM dRSTravAtrApi viyonimAdizet ॥ 3-2 ॥
hk transliteration by Sanscript