Ramírez, A. and Gutiérrez-Fonseca, P. E. (2013) “The larvae of Heteragrion majus Selys and H. atrolineatum Donnelly, with a key to known species from Costa Rica (Odonata: Megapodagrionidae)”, Zootaxa. Auckland, New Zealand, 3609(1), pp. 96–100. doi: 10.11646/zootaxa.3609.1.8.