Goodman, Nelson, author
Routledge, 1988
Buku Teks
Goldman, Alvin I., author
MIT Press, 1993
Buku Teks
Losee, John, author
Oxford University Press, 1980
Buku Teks
edited by F.S.C. Northrop
Yale University Press, 1949
Buku Teks
Whitehead, Alfred North, 1861-1947, author
Philosophical Library, 1948
Buku Teks