Sankhya Kārika
Karika 05
prativiṣayādhyavasāyo dr̥ṣṭaṁ trividhamanumānamākhyātam। talliṅgaliṅgi pūrvakamāptaśrutirāptavacanaṁ tu ॥5॥
Ascertainment of each topic is direct perception. Inference is described to be of three types. They are (a) unique form accompanied by its distinguished mark, (b) hearing from trustworthy sources and (c) statements from trustworthy sources.