Garrison, Rosser W. 2014. “Review of Oxystigma Selys With the Synonymy of Oxystigma williamsoni Geijskes (Odonata: Heteragrionidae)”. Zootaxa 3780 (2). Auckland, New Zealand:347–364. https://doi.org/10.11646/zootaxa.3780.2.7.