Gonzalez, V.H., Sepúlveda, P.A. and Griswold, T.L. 2012. Taxonomic notes on American Heriades Spinola, 1808 and Leioproctus Smith, 1853 (Hymenoptera: Megachilidae, Colletidae). Zootaxa. 3591, 1 (Dec. 2012), 75–78. DOI:https://doi.org/10.11646/zootaxa.3591.1.4.