@book { FromGrassrootstoComercializationHipHopandRapMusicintheUSA,
    title = "From Grassroots to Comercialization: Hip Hop and Rap Music in the USA",
    author = "Karl {Kovacs}",
    year = "2014",
    publisher = "Anchor Academic Publishing",
    address = "Hamburg, Germany",
    url = "https://m.anchor-publishing.com/document/312714"
}