Hedström, I., & Sahlén, G. (2001). A key to the adult Costa Rican “helicopter” damselflies (Odonata: Pseudostigmatidae) with notes on their phenology and life zone preferences. Universidad de Costa Rica.
Chicago Style CitationHedström, Ingemar, and Göran Sahlén. A Key to the Adult Costa Rican “helicopter” Damselflies (Odonata: Pseudostigmatidae) With Notes On Their Phenology and Life Zone Preferences. Universidad de Costa Rica, 2001.
MLA CitationHedström, Ingemar, and Göran Sahlén. A Key to the Adult Costa Rican “helicopter” Damselflies (Odonata: Pseudostigmatidae) With Notes On Their Phenology and Life Zone Preferences. Universidad de Costa Rica, 2001.
Warning: These citations may not always be 100% accurate.