The 2019 International Day of Light in Spain.

MLA

Yzuel, María J., et al. “The 2019 International Day of Light in Spain.” Óptica Pura y Aplicada, vol. 52, no. 4, Dec. 2019, pp. xiii–xx. EBSCOhost, https://doi.org/10.7149/OPA.52.4.xiii.

APA

Yzuel, M. J., Moreno, I., & Calvo, M. L. (2019). The 2019 International Day of Light in Spain. Óptica Pura y Aplicada, 52(4), xiii–xx. https://doi.org/10.7149/OPA.52.4.xiii

Chicago

Yzuel, María J., Ignacio Moreno, and María L. Calvo. 2019. “The 2019 International Day of Light in Spain.” Óptica Pura y Aplicada 52 (4): xiii–xx. doi:10.7149/OPA.52.4.xiii.