"Coptic Patriarch Calls 21 Beheaded Christians 'Martyrs for the Faith;' Pope Francis Says 'Their Blood Confesses Christ'" by Stoyan Zaimov, www.christianpost.com. February 16, 2015.
James Boswell, Samuel Johnson (1799). “Life of Johnson: Including Boswell's Journal of a Tour to the Hebrides and Johnson's Diary of a Journey Into North Wales”, p.469