Panko, P., Curtis, J., Gorrall, B. and Little, T. 2015. Alternatives to Randomized Control Trials: A Review of Three Quasi-experimental Designs for Causal Inference. Actualidades en Psicología. 29, 119 (Nov. 2015), 19–27. DOI:https://doi.org/10.15517/ap.v29i119.18810.