• Maurice, Frederick; The Religions of the World and their Relations to Christianity Considered https://archive.org/details/thereligionsofth00mauruoft/page/n5/mode/2up
• Sell, Edward; The Faith of Islam https://archive.org/details/faithofislam00sell/page/n5/mode/2up
• Tisdall, William; A Manual of the Leading Muhammadan Objections to Christianity https://archive.org/details/amanualofthelead00tisduoft/page/n3/mode/2up
• Tisdall, William; India, its history, darkness and dawn https://archive.org/details/indiaitshistoryd00tisd/page/n7/mode/2up
• Murdoch, John; Caste: its supposed origin: its history; its effects &c. https://archive.org/details/casteitssupposed00murdiala/page/n3/mode/2up
• McCaul, Alexander; The Old Paths https://archive.org/details/oldpathsortalmud00mccaiala/page/n3/mode/2up