@book { StatesofNature,
    title = "States of Nature",
    author = "Christoper {La Barbera}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/978-1-4539-0839-6",
    url = "https://www.peterlang.com/document/1051123"
}