@book { PlanificacinfamiliarypapelsocialdelamujerenPolonia,
    title = "Planificación familiar y papel social de la mujer en Polonia",
    author = "Zaneta {Nowak}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656475484",
    url = "https://www.hausarbeiten.de/document/231740"
}