• [Wiki] http://en.wikipedia.org/wiki/Psammophylax_rhombeatus.
• [EoL] https://eol.org/pages/1055560/articles.
• [AnAge] https://genomics.senescence.info/species/entry.php?species=Psammophis_subtaeniatus.
• [Bour1970] Bourquin, O. (1970). A note on the growth of spotted skaapsteker embryos (Psammophylax rhombeatus). The Journal of the Herpetological Association of Africa, 6(1):8--9. doi:10.1080/04416651.1970.9650762.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.