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Latane, B.; Darley, J.M. (1968). "Group inhibition of bystander intervention". Journal of Personality and Social Psychology. 10 (3): 215–221. doi:10.1037/h0026570. PMID5704479. S2CID28550502.
Bareinboim, Elias; Pearl, Judea (2013). "A general algorithm for deciding transportability of experimental results". Journal of Causal Inference. 1 (1): 107–134. arXiv:1312.7485. doi:10.1515/jci-2012-0004. S2CID13325846.
Marcellesi, Alexandre (December 2015). "External validity: Is there still a problem?". Philosophy of Science. 82 (5): 1308–1317. doi:10.1086/684084. S2CID125072255.
Hutchinson, J. Wesley; Kamakura, Wagner A.; Lynch, John G. (2000). "Unobserved Heterogeneity as an Alternative Explanation for "Reversal" Effects in Behavioral Research". Journal of Consumer Research. 27 (3): 324–344. doi:10.1086/317588. JSTOR10.1086/317588. S2CID16353123.
Latane, B.; Darley, J.M. (1968). "Group inhibition of bystander intervention". Journal of Personality and Social Psychology. 10 (3): 215–221. doi:10.1037/h0026570. PMID5704479. S2CID28550502.