@book { SmallGroupResearch,
    title = "Small Group Research",
    author = "Herbert H. {Blumberg} and A. Paul {Hare} and M. Valerie {Kent} and Martin F. {Davies}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Oxford, United Kingdom",
    url = "https://www.peterlang.com/document/1104170"
}