Kortmann, Bernd (Ed.) and Kerstin Lunkenheimer (Ed.). The Mouton World Atlas of Variation in English. Berlin, Boston: De Gruyter Mouton, 2012. Web. Retrieved 18 May. 2013, from http://www.degruyter.com/view/product/181631

Kortmann, B. (Ed.) & Lunkenheimer, K. (Ed.) (2012). The Mouton World Atlas of Variation in English. Berlin, Boston: De Gruyter Mouton. Retrieved 18 May. 2013, from http://www.degruyter.com/view/product/181631

Kortmann, Bernd (Ed.) and Kerstin Lunkenheimer (Ed.). 2012. The Mouton World Atlas of Variation in English. Berlin, Boston: De Gruyter Mouton. Retrieved 18 May. 2013, from http://www.degruyter.com/view/product/181631