MILLS, C.; COETZEE, N.; NORTJE, E.; KLEYNHANS, M.; FERREIRA, R.; FRASER, W.; DU TOIT, P. The effect of emotional state on the learning of visual skills. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt;, v. 33, n. 1, p. 9 bladsye, 13 nov. 2014.