A. Gutiérrez and  A. Castillo and  J. M. Gómez and  J. M. Gutiérrez and  A. García-Cabot,  Traffic Signs.   journal   = {International Journal of Humanities and Social Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2013, vol. 75(3). 543 - 546
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/8453.