^Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp.
ISBN978-1-4214-0135-5. (Heliobolus neumanni, p. 189; H. spekii, p. 249).
Further reading
Arillo A,
Balletto E,
Spanò S (1965). "II e III spedizione Scortecci in Migiurtinia: il genere EremiasWiegmann (Reptilia, Lacertidae)". Bollettino dei Musei e degli Istituti Biologici della Università di Genova33: 85–109. (Eremias spekii scorteccii, new subspecies). (in Italian).
Goldberg SR (2009). "Reproduction in Speke's Sand Lizard, Heliobolus spekii (Squamata: Lacertidae) from Kenya". African Herp News (48): 2–4.
Günther A (1872). "Description of three new Species of Eremias ". Annals and Magazine of Natural History, Fourth Series9: 381–382. (Eremias spekii, new species, p. 381).
Stejneger L (1893). "On some collections of reptiles and batrachians from East Africa and the adjacent islands, recently received from Dr.
W. L. Abbott and Mr.
William Astor Chanler, with descriptions of new species". Proceedings of the United States National Museum16: 711–741. (Eremias sextæniata, new species, pp. 718–719).