Brihat Parashara Hora Shastra
राशितो ग्रहतश्चापि विज्ञेया द्विविधाऽर्गला । निर्बाधका सुफलदा विफला च सबाधका ॥ ८॥
Argalas should be counted from a Rāśi, or a Grah, as the case may be. The Argala, which is unobstructed will be fruitful, while the one duly obstructed will go astray.
english translation
rAzito grahatazcApi vijJeyA dvividhA'rgalA । nirbAdhakA suphaladA viphalA ca sabAdhakA ॥ 8॥
hk transliteration by Sanscript