@book { TheMissionaryFactorinEthiopia,
    title = "The Missionary Factor in Ethiopia",
    author = "Getatchew {Haile} and Aasulv {Lande} and Samuel {Rubenson}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086715"
}