@book { TheEnglishGerundParticiple,
    title = "The English Gerund-Participle",
    author = "Patrick J. {Duffley}",
    year = "2006",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1102005"
}