@BOOK{Luke1990, address = "Amsterdam", author = "Kang-kwong Luke", doi = "10.1075/pbns.9", keywords = "EMCA, Cantonese, Particle", publisher = "John Benjamins", title = "Utterance Particles in Cantonese Conversation", url = "https://benjamins.com/catalog/pbns.9", year = "1990", }