Dunlap, Peter T., author
Routledge; Taylor & Francis Group, 2008
Buku Teks
Burton, Steven J.
Canbridge University Press, 1992
Buku Teks
Faith, Nicholas
Motorbooks International, 1995
Buku Teks
Santayana, George, author
Dover, 1955
Buku Teks
Ferraby, John, author
Baha'i, 2011
Buku Teks