Gratwicke, Brian, Bennett, E., Broad, S., Christie, S., Dutton, A., Gabriel, G., Kirkpatrick, C., and Nowell, K. 2008. "The world can't have wild tigers and eat them too." Conservation Biology, 22, (1) 222–223. https://doi.org/10.1111/j.1523-1739.2007.00802.x.