Prussian physician Robert Koch is best known for isolating the bacterium which causes tuberculosis, the cause of numerous deaths in the mid-19th century.
Robert Koch. (2013). The Biography Channel website. Retrieved 08:16, May 18, 2013, from http://www.biography.com/people/robert-koch-9367370.
Robert Koch. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/robert-koch-9367370 [Accessed 18 May 2013].
"Robert Koch." 2013. The Biography Channel website. May 18 2013, 08:16 http://www.biography.com/people/robert-koch-9367370.
"Robert Koch," The Biography Channel website, 2013, http://www.biography.com/people/robert-koch-9367370 [accessed May 18, 2013].
"Robert Koch," The Biography Channel website, http://www.biography.com/people/robert-koch-9367370 (accessed May 18, 2013).
Robert Koch [Internet]. The Biography Channel website; 2013 [cited 2013 May 18] Available from: http://www.biography.com/people/robert-koch-9367370.
Robert Koch, http://www.biography.com/people/robert-koch-9367370 (last visited May 18, 2013).
Robert Koch. The Biography Channel website. 2013. Available at: http://www.biography.com/people/robert-koch-9367370. Accessed May 18, 2013.