Irving Berlin copyrights the biggest pop song of the early 20th century. (2013). The History Channel website. Retrieved 6:52, May 21, 2013, from http://www.history.com/this-day-in-history/irving-berlin-copyrights-the-biggest-pop-song-of-the-early-20th-century.
Irving Berlin copyrights the biggest pop song of the early 20th century. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/this-day-in-history/irving-berlin-copyrights-the-biggest-pop-song-of-the-early-20th-century [Accessed 21 May 2013].
“Irving Berlin copyrights the biggest pop song of the early 20th century.” 2013. The History Channel website. May 21 2013, 6:52 http://www.history.com/this-day-in-history/irving-berlin-copyrights-the-biggest-pop-song-of-the-early-20th-century.
“Irving Berlin copyrights the biggest pop song of the early 20th century,” The History Channel website, 2013, http://www.history.com/this-day-in-history/irving-berlin-copyrights-the-biggest-pop-song-of-the-early-20th-century [accessed May 21, 2013].
“Irving Berlin copyrights the biggest pop song of the early 20th century,” The History Channel website, http://www.history.com/this-day-in-history/irving-berlin-copyrights-the-biggest-pop-song-of-the-early-20th-century (accessed May 21, 2013).
Irving Berlin copyrights the biggest pop song of the early 20th century [Internet]. The History Channel website; 2013 [cited 2013 May 21] Available from: http://www.history.com/this-day-in-history/irving-berlin-copyrights-the-biggest-pop-song-of-the-early-20th-century.
Irving Berlin copyrights the biggest pop song of the early 20th century, http://www.history.com/this-day-in-history/irving-berlin-copyrights-the-biggest-pop-song-of-the-early-20th-century (last visited May 21, 2013).
Irving Berlin copyrights the biggest pop song of the early 20th century. The History Channel website. 2013. Available at: http://www.history.com/this-day-in-history/irving-berlin-copyrights-the-biggest-pop-song-of-the-early-20th-century. Accessed May 21, 2013.