Rial Bobueta, Antonio, Jesús Varela Mallou, y Teresa Braña Tobío. «Consumer preferences and brand equity measurement of Spanish national daily newspapers: A conjoint analysis approach». The Spanish Journal of Psychology, vol. 4, vol. 4, n.º 1, 2001, p. 48, https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0101120048A.