There are these studies all over the internet. I mean  you basing this wiki article off one book with biased views obviously from latinos who want to take credit in the creation. The sad thing is that even the wiki article shows the truth. The people who started and created the music, the dancing , the scratching, the raping were all black people. There for African Americans, and Jamaicans ( NOT LATINOS) get credited as being the creators of the art forms. You can add Latino contributions later. Other the title is missleading in stating that Latinos CREATED the artform. Which is not the case. Even the " freshest kids" documentary states this. 

 Here is ONE example. From a "credible" source. 

 http://www.forbes.com/2009/07/09/afrika-bambaataa-hip-hop-music-business-entertainment-cash-kings-bambaataa.html