Funelas, J. E. (2000). How do we know?: Karl Popper and the functionality of metaphysics in everlasting epistemology. UST Pub. House.
Lua i Stíl Chicago (17ú heag.)Funelas, John Escarel. How Do We Know?: Karl Popper and the Functionality of Metaphysics in Everlasting Epistemology. Espana, Manila: UST Pub. House, 2000.
Lua MLA (9ú heag.)Funelas, John Escarel. How Do We Know?: Karl Popper and the Functionality of Metaphysics in Everlasting Epistemology. UST Pub. House, 2000.
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