@book { ZurGeschichtederPsychologieinBerlin,
    title = "Zur Geschichte der Psychologie in Berlin",
    author = "Lothar {Sprung} and Wolfgang {Schönpflug}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095245"
}