Brihat Parashara Hora Shastra
मध्येऽनुपातात् सर्वत्र द्रेष्काणेऽपि विचिन्तयेत्। गृहवत् तुर्यभागेपि नवांशादावपि स्वयम्॥ १५॥
Full, medium and nil will be the effects, respectively, in the beginning middle and the end of a Hora. Similar applications be made for a Dreshkan, Turyāńś, Navāńś etc
english translation
madhye'nupAtAt sarvatra dreSkANe'pi vicintayet। gRhavat turyabhAgepi navAMzAdAvapi svayam॥ 15॥
hk transliteration by Sanscript