A. Bertsch, H. Schweer, A. Titze and H. Tanaka (2005) "Male labial gland secretions and mitochondrial DNA markers support species status of Bombus cryptarum and B. magnus (Hymenoptera, Apidae)". Insectes Sociaux 52 (1):45-54, DOI:10.1007/s00040-004-0761-1
