@book { MotiveundMotivationinderTrendsportartBeachvolleyball, title = "Motive und Motivation in der Trendsportart Beachvolleyball", author = "Judith {Meyer}", year = "2008", publisher = "Diplom.de", address = "Hamburg, Germany", doi = "10.3239/9783836619851", url = "https://m.diplom.de/document/226180" }