@book { TheemergingblackmiddleclassinSouthAfricaanditsrelationtodemocracy,
    title = "The emerging black middle class in South Africa and its relation to democracy",
    author = "Tobias {Erbert}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656544012",
    url = "https://www.hausarbeiten.de/document/264670"
}