@book{hestemmetal,
    type = "book",
    editor = "Peter Rowlett",
    year = "2012",
    title = {Media Enhanced Teaching and Learning: case studies and evidence of effective use},
    publisher = "Maths, Stats and OR Network",
    address = "Birmingham, U.K.",
    url = "http://www.mathcentre.ac.uk/resources/uploaded/metalbooklet.pdf"
}