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. Auckland, New Zealand, 3591(1), pp. 75–78. doi: 10.11646/zootaxa.3591.1.4.