Torres-Ruiz, A., & Jones, R. W. (2012). (på engelska)Journal of Economic Entomology 105 (6). https://www.ncbi.nlm.nih.gov/pubmed/23356048 Comparison of the efficiency of the bumble bees Bombus impatiens and Bombus ephippiatus (Hymenoptera: Apidae) as pollinators of tomato in greenhouses.. Läst 27 februari 2020.