1. Bardel, C. 2010. The lexicon of advanced L2 learners. In Kenneth Hyltenstam (eds.) High-level proficiency in second language use. Berlin: Mouton de Gruyter.
2. Bardel, C. and Falk, Y. 2007. The role of the second language in third language acquisition: the case of Germanic syntax. Second Language Research 23: 459–84.
3. Bouvy, C. 2000. Towards the construction of a theory of cross-linguistic transfer. In English in Europe:The acquisition of a third language, ed. J. Cenoz and U. Jessner, 143–156. Clevedon: Multilingual Matters.
4. Cenoz, J. 2001. The effect of linguistic distance, L2 status and age on cross-linguistic influence in third language acquisition. In Cross-linguistic influence in third language acquisition: Psycholinguistic perspectives, ed. J. Cenoz, B. Hufeisen, and U. Jessner, 8–19. Clevedon, UK: Multilingual Matters.
5. Cenoz, J. and Jessner, U. 2000. The English in Europe. The Acquisition of a Third Language. Clevedon: Multilingual Matters (Bilingual Education and Bilingualism, 19).