Hymenoptera of America north of Mexico :
synoptic catalog, second supplement /
prepared by the staff and collaborators of the Hymenoptera Unit, Insect Identification and Parasite Introduction Research Branch, Entomology Research Division, Agricultural Research Service, under the direction of Karl V. Krombein and B.D. Burks.
APA Citation
Burks, B. D. (Barnard DeWitt)., Krombein, K. V. (1967). Hymenoptera of America north of Mexico: synoptic catalog, second supplement. Washington, D.C.: U.S. Dept. of Agriculture.
MLA Citation
Burks, B. D. (Barnard DeWitt), and Karl V Krombein. Hymenoptera of America North of Mexico: Synoptic Catalog, Second Supplement. Washington, D.C.: U.S. Dept. of Agriculture, 1967.
Warning: These citations may not always be complete (especially for serials).