Olivera Zaldua, María. “Photography in the Spanish Protectorate. Photographic Archives in Fernando Valderrama’s Legacy from the Islamic Library (AECID Library)”. Revista General de Información Y Documentación, vol. 24, no. 1, July 2014, pp. 155-82, https://doi.org/10.5209/rev_RGID.2014.v24.n1.45387.