@book { TheFiveVitalSignsofConversation,
    title = "The Five Vital Signs of Conversation",
    author = "Norman {Markel}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/978-1-4539-0467-1",
    url = "https://www.peterlang.com/document/1050912"
}