McGrath, Alister E., author
Wiley-Blackwell, 2011
Buku Teks
Hofstadter, Richard
George Braziller, 1959
Buku Teks
Martin Brinkworth
Springer, 2012
eBooks
Doyglas J. Davies, author
Berg, 2002
Buku Teks
Rahner, Karl, author
The Crossroad Publishing Company, 1981
Buku Referensi