Mastenbroek, Richard. "Black-neck Spitting Cobra"(PDF). DEVENOMIZED. www.devenomized.com. Archived from the original(PDF) on 25 April 2012. Retrieved 20 December 2011.
Mastenbroek, Richard. "Black-neck Spitting Cobra"(PDF). DEVENOMIZED. www.devenomized.com. Archived from the original(PDF) on 25 April 2012. Retrieved 20 December 2011.