Artikel Jurnal
edited by Richard Andrews
Routledge, 2004
Buku Teks
Hubbard, L. Ron, 1911-1986, author
Bridge Publications, Inc., 2012
Buku Referensi
Anas M. Adam, author
UIN Ar-Raniry , 2017
Artikel Jurnal
Stephens, Ian, author
Ernest Benn, 1963
Buku Teks