@book { UmweltbildunganSchuleninGhana,
    title = "Umweltbildung an Schulen in Ghana",
    author = "Udo {Nauber}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842807013",
    url = "https://m.diplom.de/document/228156"
}