Alfred A Knopf was an American book publisher who founded Alfred A. Knopf, Inc., in 1915. In 1966 it became a subsidiary of Random House, Inc.
Alfred A. Knopf. (2013). The Biography Channel website. Retrieved 11:53, May 21, 2013, from http://www.biography.com/people/alfred-a-knopf-9367036.
Alfred A. Knopf. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/alfred-a-knopf-9367036 [Accessed 21 May 2013].
"Alfred A. Knopf." 2013. The Biography Channel website. May 21 2013, 11:53 http://www.biography.com/people/alfred-a-knopf-9367036.
"Alfred A. Knopf," The Biography Channel website, 2013, http://www.biography.com/people/alfred-a-knopf-9367036 [accessed May 21, 2013].
"Alfred A. Knopf," The Biography Channel website, http://www.biography.com/people/alfred-a-knopf-9367036 (accessed May 21, 2013).
Alfred A. Knopf [Internet]. The Biography Channel website; 2013 [cited 2013 May 21] Available from: http://www.biography.com/people/alfred-a-knopf-9367036.
Alfred A. Knopf, http://www.biography.com/people/alfred-a-knopf-9367036 (last visited May 21, 2013).
Alfred A. Knopf. The Biography Channel website. 2013. Available at: http://www.biography.com/people/alfred-a-knopf-9367036. Accessed May 21, 2013.