@book { OnChineseModalParticleA,
    title = "On Chinese Modal Particle A (啊)",
    author = "Ying Xian Ingrid {Wang}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/978-3-0351-0543-8",
    url = "https://www.peterlang.com/document/1052840"
}