«Boulengerina annulata», Armed Forces Pest Management Board (United States Department of Defense), arkivert frå originalen 9. januar 2012, henta 16. februar 2012
doi.org
dx.doi.org
Weinstein, Scott A.; James J. Schmidt; Leonard A. Smith (30 March 1991). «Lethal toxins and cross-neutralization of venoms from the African water cobras, Boulengerina annulata annulata and Boulengerina christyi». Toxicon29 (11): 1315–1327. PMID1814007. doi:10.1016/0041-0101(91)90118-B.
Weinstein, Scott A.; James J. Schmidt; Leonard A. Smith (30 March 1991). «Lethal toxins and cross-neutralization of venoms from the African water cobras, Boulengerina annulata annulata and Boulengerina christyi». Toxicon29 (11): 1315–1327. PMID1814007. doi:10.1016/0041-0101(91)90118-B.
«Boulengerina annulata», Armed Forces Pest Management Board (United States Department of Defense), arkivert frå originalen 9. januar 2012, henta 16. februar 2012