The Compendium of Caraka 3.7.15

3.7.15

tatrāpakarṣaṇaṃ-hastenābhigṛhya vimṛśyopakaraṇavatā 'apanayanamanupakaraṇena vā; sthānagatānāṃ tu krimīṇaṃ bheṣajenāpakarṣaṇaṃ nyāyataḥ, taccaturvidhaṃ; tadyathā---śirovirecanaṃ, vamanaṃ, virecanam, āsthāpanaṃ ca; ityapakarṣaṇavidhiḥ/

"Among them, extraction is removal by grasping with the hand and inspecting, either with instruments or without instruments; but for worms located in the internal organs, extraction is performed systematically with medicine, and that is of four kinds, namely: head-purging, emesis, purgation, and non-unctuous enema. Such is the procedure of extraction."