Ishimitsu, Γαία and Beda, Q. (2000) Mating rituals of the Green Anaconda. Husbandry Times, 5 (9). pp. 51-68.
Joergensen, N. and Calafat, B. (2003) Migration routes of the Plains Zebra. In: 6th Symposium on Taxonomy, 4-9 May, Moscow.