Robertson, John M.
A short history of Christianity
Watts & Co, 1931
 Buku Teks SO
Leroux, Jean-Marie
The New people of God a short history of the church
Notre Dame, 1963
 Buku Teks
Piggin, Stuart
Faith of steel a history of the Christian churches in Illawarra, Australia / by Stuart Piggin
The University of Wollongong, 1984
 Buku Teks
The journal of modern history
The University of Chicago Press, 2018
 Majalah, Jurnal, Buletin
Husseini, Sara Leila
Early Christian-Muslim debate on the unity of God: three Christian scholars and their engagement with Islamic thought (9th century c.e.)
Brill, 2014
 eBooks