SMITH, F. 1853. Catalogue of Hymenopterous Insects in the Collection of the British Museum. Part I. Andrenidae and Apidae. London: British Museum 1-198 pp
DUCKE, A. 1908. Contributions à la connaissance des hyménoptères des deux Amériques. Rev. Entomol. (Caen) 27 (3): 28-55
BRÈTHES, J. 1909b. Hymenoptera paraguayensis. An. Mus. Nac. Hist. Nat. B. Aires (3) 19: 225-256
URBAN, D. 1967a. As espécies do gênero Thygater Holmberg, 1884 (Hymenoptera, Apoidea). Bol. Univ. Fed. Parana, Zool. 2 (12): 177-309
URBAN, D. 1968a. As espécies de Gaesischia Michener, LaBerge & Moure, 1955. Bol. Univ. Fed. Parana, Zool. 3 (4): 79-129