Grissell, E.E. 1979, Family Torymidae. Catalog of Hymenoptera in America North of Mexico 1:754
(Eds: Krombein, K.V.; Hurd, P.D.; Smith, D.R.; Burks, B.D.)
Smithsonian Institution Press, Washington, D.C.
Osten-Sacken, R. 1870, Contributons to the natural history of the Cynipidae of the United State [sic] and their galls. Transactions of the American Entomological Society 3:61
(Parasitoid identification correct)
Peck, O. 1963, A catalogue of the Nearctic Chalcidoidea (Insecta; Hymenoptera). Canadian Entomologist (Supplement) 30:543