Tess Gerritsen (2015). “The Rizzoli & Isles Series 11-Book Bundle: The Surgeon, The Apprentice, The Sinner, Body Double, Vanish, The Mephisto Club, The Keepsake, Ice Cold, The Silent Girl, Last to Die, Die Again”, p.876, Ballantine Books
Robert Murray M'Cheyne, Andrew Alexander Bonar (1846). “Memoir and Remains of the Rev. Robert Murray M'Cheyne: Minister of St. Peter's Church, Dundee”, p.151