Gürel, A., “L2 Acquisition of Pragmatic and Syntactic Constraints in the use of Overt and Null Subject Pronouns”, Inquiries in Linguistic Development, Dil Gelişimi Araştırmaları, R. Slabakova, P. Prévost, S. Montrul, (Derleyenler), 258-282, Amsterdam: Johns Benjamins Pub. Co., 2006.