@book { AttitudesandPerceptionstowardPhysicalEducationAStudyinSecondarySchoolStudents,
    title = "Attitudes and Perceptions toward Physical Education: A Study in Secondary School Students",
    author = "Rolf {Kretschmann} and Daniel {Wrobel}",
    year = "2015",
    publisher = "Anchor Academic Publishing",
    address = "Hamburg, Germany",
    url = "https://m.anchor-publishing.com/document/303546"
}