@book { CriticalPeriodHypothesisRevisited,
    title = "Critical Period Hypothesis Revisited",
    subtitle = "The Impact of Age on Ultimate Attainment in the Pronunciation of a Foreign Language - Including CD",
    author = "Malgorzata {Jedynak}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106438"
}