Marcio Martins, Ricardo J. Sawaya, Otavio A. V. Marques: A First Estimate of the Population Size of the Critically Endangered Lancehead, Bothrops insularis. In: South American Journal of Herpetology. 3. Jahrgang, Nr.2, 2008, S.168–174, doi:10.2994/1808-9798(2008)3[168:AFEOTP]2.0.CO;2.
Marcio Martins, Ricardo J. Sawaya, Otavio A. V. Marques: A First Estimate of the Population Size of the Critically Endangered Lancehead, Bothrops insularis. In: South American Journal of Herpetology. 3. Jahrgang, Nr.2, 2008, S.168–174, doi:10.2994/1808-9798(2008)3[168:AFEOTP]2.0.CO;2.