Wilden, E. & Porsch, R. (Eds.). (2017). The professional development of primary EFL teachers. National and international research. Münster: Waxmann.
Porsch R. & Wilden, E. (2017). The development of a curriculum-based C-test for young EFL learners. In J. Enever & E. Lindgren (Eds.), Researching the complexity of early language learning in instructed context (pp. 289-304). Clevedon: Multilingual Matters.