@book { EnhancingselfdirectedVocabularyLearningResearchandPractice, title = "Enhancing self-directed Vocabulary Learning: Research and Practice", author = "Jing {Wu}", year = "2013", publisher = "Peter Lang Verlag", address = "Lausanne, Switzerland", doi = "10.3726/978-3-0351-0507-0", url = "https://www.peterlang.com/document/1052857" }