Beutel, Rolf G., Frank Friedrich, Xing-Ke Yang, et al. Insect Morphology and Phylogeny. Berlin, Boston: De Gruyter, 2013. Web. Retrieved 26 May. 2013, from http://www.degruyter.com/view/product/178527

Beutel, R., Friedrich, F., Yang, X., et al. (2013). Insect Morphology and Phylogeny. Berlin, Boston: De Gruyter. Retrieved 26 May. 2013, from http://www.degruyter.com/view/product/178527

Beutel, Rolf G., Frank Friedrich, Xing-Ke Yang, et al. 2013. Insect Morphology and Phylogeny. Berlin, Boston: De Gruyter. Retrieved 26 May. 2013, from http://www.degruyter.com/view/product/178527