'Variation in Interlanguage Morphology' (Peter Lang, 1991)
'Talking and Testing: Discourse Approaches to the Assessment of Oral Proficiency' (Benjamins, 1998)
'Language and Interaction: An Advanced Resource Book' (Routledge, 2008)
'Discursive Practice in Language Learning and Teaching' (Wiley-Blackwell, 2009)
Introduction to Second Language Acquisition;
Research in Second Language Acquisition;
Cross-cultural Pragmatics;
World Englishes;
Interactional Competence;
English in Society