Dr Alfred Charles Barker, photographer, 1819–1873 [online]. Christchurch City Libraries [cit. 2013-04-27]. Dostupné online.Je zde použita šablona {{Cite web}} označená jako k „pouze dočasnému použití“.
teara.govt.nz
Turner, John B. "Alfred Charles Barker". Dictionary of New Zealand Biography. Ministry for Culture and Heritage. Retrieved 16 September 2012. https://teara.govt.nz/en/biographies/1b4