Hedström, Ingemar, Jessica Harris, and Kimberly Fergus. 2006. “Euglossine Bees As Potential Bio-Indicators of Coffee Farms: Does Forest Access, on a Seasonal Basis, Affect Abundance?”. Revista De Biología Tropical 54 (4):1189–1195. https://doi.org/10.15517/rbt.v54i4.14101.