Charak Samhita
तत्र श्लोकः- कषायैर्नव चूर्णैश्च पञ्चोक्ताः सलिलैस्त्रयः। एकश्च कृशरायां स्याद्योगास्तेऽष्टादश स्मृताः ॥१२॥
[Summary] Now the summing up verse – Nine preparations with decoction, five with powder, three with waters and one with krishara – thus total eighteen formulations have been said.
english translation