@book { ToolsforImprovingPrincipalsWork,
    title = "Tools for Improving Principals’ Work",
    author = "Jianping {Shen}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1109153"
}