1. Animal Diversity Web (University of Michigan Museum of Zoology): https://animaldiversity.org/accounts/Elasmobranchii/classification/#Elasmobranchii.
2. Elasmo.com: http://www.elasmo.com/selachin/slides/ss_dentition.html?sp=sharks. (Images and numerical data on dentitions and tooth morphology of numerous shark species).
3. Elasmodiver Shark and Ray Field Guide: http://www.elasmodiver.com/sharks_and_rays.html.
4. Florida Museum of Natural History: www.flmnh.ufl.edu/fish/Sharks/sharks.htm.
5. Goblin Shark Jaw Protrusion: https://www.bing.com/videos/search?q=goblin+shark+eating+video&&view=detail&mid=12301A2FB5262373A27212301A2FB5262373A272&rvsmid=A1F5B5339823DC1C4E25A1F5B5339823DC1C4E25&FORM=VDQVAP.