Referência bibliográfica
Garrison, R.W. & von Ellenrieder, N. (2007) The true Argia difficilis Selys, 1865, with the description of Argia yungensis sp. nov. (Odonata: Coenagrionidae). Transactions of the American Entomological Society 133(1–2): 189–204.
DOI: 10.3157/0002-8320(2007)133[189:TTADSW]2.0.CO;2.