1. Al-Kasey, T., & Pérez-Leroux, A.-T. (1998). Second language acquisition of Spanish null subjects. In S. Flynn, G. Matohardjono, & W. O’Neil (Eds.), The generative study of second language acquisition (pp. 161–185). Hillsdale, NJ: Lawrence Erlbaum.
2. Alonso-Ovalle, L., Fernández-Solera, S., Frazier, L., & Clifton, C. (2002). Null vs. overt pronouns and the topic-focus articulation in Spanish. Journal of Italian Linguistics, 14(2), 151–169.
3. Bel, A., & García-Alcaraz, E. (2015). Subject pronouns in the L2 Spanish of Moroccan Arabic speakers. In T. Judy & S. Perpiñán (Eds.), The acquisition of Spanish in understudied language pairings (pp. 201–232). Amsterdam: John Benjamins.
4. Bel, A., Perera, J., & Salas, N. (2010). Anaphoric devices in written and spoken narrative discourse: Data from Catalan. Written Language and Literacy, 13(2), 234–257.
5. Bel, A., Sagarra, N., Comínguez, J. P., & García-Alcaraz, E. (2016). Transfer and proficiency effects in L2 processing of subject anaphora. Lingua. https://doi.org/10.1016/j.lingua.2016.07.001 .