Chavarria, Gabriela (1996). "Notes on a Combined Nest of Bombus pullatus (Hymenoptera: Apidae) and Acromyrmex octospinosus (Hymenoptera: Formicidae)". Journal of the Kansas Entomological Society. 69 (4): 403–405. ISSN0022-8567. JSTOR25085736.
Chavarria, Gabriela (1996). "Notes on a Combined Nest of Bombus pullatus (Hymenoptera: Apidae) and Acromyrmex octospinosus (Hymenoptera: Formicidae)". Journal of the Kansas Entomological Society. 69 (4): 403–405. ISSN0022-8567. JSTOR25085736.