Bombus difficillimus (Swedish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Bombus difficillimus" in Swedish language version.

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doi.org

Paul Williams, Ya Tang, Jian Yao & Sydney Cameron (2008). ”The bumblebees of Sichuan (Hymenoptera: Apidae, Bombini)” (på engelska) (PDF (9,34 MB)). Systematics and Biodiversity. University of Illinois. sid. 9, 39. doi:10.1017/S1477200008002843. http://www.life.illinois.edu/scameron/pdfs/Williams&al09_Sichuan.pdf. Läst 12 maj 2010.

Paul Williams, Ya Tang, Jian Yao & Sydney Cameron (2008). ”The bumblebees of Sichuan (Hymenoptera: Apidae, Bombini)” (på engelska) (PDF (9,34 MB)). Systematics and Biodiversity. University of Illinois. sid. 9, 39. doi:10.1017/S1477200008002843. http://www.life.illinois.edu/scameron/pdfs/Williams&al09_Sichuan.pdf. Läst 12 maj 2010.