Bulletin of the British Museum (Natural History) Entomology - British Museum (Natural History) (The Museum, 1976)

Catalog of hymenoptera in America north of Mexico - Krombein, Karl V. (Smithsonian Institution Press, 1979)

Entomologische berichten - Nederlandse Entomologische Vereniging (1998)

Hymenoptera of America north of Mexico : synoptic catalog, second supplement - Krombein, Karl V. (U.S. Dept. of Agriculture, 1967)

Natural history of the Bistcho Lake Region, Northwest Alberta - Provincial Museum of Alberta. Natural History Section. (Natural History Section, Provincial Museum of Alberta, 1988)

The naturalist - West-Riding Consolidated Naturalists' Society (Simpkin, Marshall, 2009)

The naturalist - West-Riding Consolidated Naturalists' Society (Simpkin, Marshall, 2021)