Bergmann, Ludwig, Clemens Schaefer and Wilhelm Raith. "6. Licht" Elektromagnetismus. Berlin, Boston: Walter de Gruyter, 2006. 375-459. Web. Retrieved 25 May. 2013, from http://www.degruyter.com/view/books/9783110199284/9783110199284.1.375/9783110199284.1.375.xml

Bergmann, L., Schaefer, C. & Raith, W. (2006). 6. Licht. Elektromagnetismus (pp. 375-459). Berlin, Boston: Walter de Gruyter. Retrieved 25 May. 2013, from http://www.degruyter.com/view/books/9783110199284/9783110199284.1.375/9783110199284.1.375.xml

Bergmann, Ludwig, Clemens Schaefer and Wilhelm Raith. 2006. 6. Licht. In Elektromagnetismus, 375-459. Berlin, Boston: Walter de Gruyter. Retrieved 25 May. 2013, from http://www.degruyter.com/view/books/9783110199284/9783110199284.1.375/9783110199284.1.375.xml