@book { GermanCommunicativeDevelopmentInventory,
    title = "German Communicative Development Inventory",
    author = "Gisela {Szagun} and Barbara {Stumper} and Satyam Antonio {Schramm}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03521-6",
    url = "https://www.peterlang.com/document/1048089"
}