1. Metadiscourse in L1 and L2 English;Ädel,2006
2. The use of adverbial connectors in advanced Swedish learners’ written English;Altenberg,1998
3. Academic writing: A handbook for international students;Bailey,2006
4. Intra-textual variation within medical research articles;Biber,1994
5. Longman grammar of spoken and written English;Biber,1999