Jelaskan Rujukan dari Ragi kehidupan dalam bahasa melayu

Heart of the Earth: The Elixir of Life, second novel in the trilogy by Richard Anderson

Naam or Word, Book Three: Amrit, Nectar or Water of Life

Needham, Joseph, Ping-Yu Ho, Gwei-Djen Lu. Science and Civilisation in China, Volume V, Part III. Cambridge at the University Press, 1976.

Turner, John D. (transl.).  The Interpretation of Knowledge