Hammond, P. S., Bearzi, G., Bjørge, A., Forney, K., Karczmarski, L., Kasuya, T., Perrin, W. F., Scott, M. D., Wang, J. Y., Wells, R. S. & Wilson, B. (2008). Phocoena dioptricaArxivləşdirilib 2011-09-21 at the Wayback Machine. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 24 March 2009. Database entry includes justification for why this species is listed as data deficient
web.archive.org
Hammond, P. S., Bearzi, G., Bjørge, A., Forney, K., Karczmarski, L., Kasuya, T., Perrin, W. F., Scott, M. D., Wang, J. Y., Wells, R. S. & Wilson, B. (2008). Phocoena dioptricaArxivləşdirilib 2011-09-21 at the Wayback Machine. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 24 March 2009. Database entry includes justification for why this species is listed as data deficient