@book { PerspectivesontrophyhuntingintourismNamibiaasacasestudy,
    title = "Perspectives on trophy hunting in tourism; Namibia as a case study",
    author = "Bernd {Grahl}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640962792",
    url = "https://www.hausarbeiten.de/document/175328"
}