Collins, J. P., & Crump, M. L. (2009). Extinction in our times: Global amphibian decline. Oxford University Press.
Chicago-čujuhus (17. p.)Collins, James P., juo Martha L. Crump. Extinction in Our Times: Global Amphibian Decline. Oxford ; New York: Oxford University Press, 2009.
MLA-čujuhus (9. p.)Collins, James P., juo Martha L. Crump. Extinction in Our Times: Global Amphibian Decline. Oxford University Press, 2009.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.