@book { SocialDifferentiationinCameroonEnglish,
    title = "Social Differentiation in Cameroon English",
    subtitle = "Evidence from Sociolinguistic Fieldwork",
    author = "Aloysius {Ngefac}",
    year = "2008",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1104624"
}