The Acquisition of the Passive Voice in L2-English: Perception and Production
D. Keatinge, J.-U. Keßler, in: Research in Second Language Acquisition: Empirical Evidence Across Languages, Cambridge Scholar Press, Newcastle upon Tyne, 2009, pp. 67–92.

Research in Second Language Acquisition: Empirical Evidence Across Languages
J.-U. Keßler, D. Keatinge, eds., Research in Second Language Acquisition: Empirical Evidence Across Languages, Cambridge Scholar Press, Newcastle upon Tyne, 2009.