Ramírez Jiménez, David. “The chancery of the spanish first secretary of state and of the office - department of state, during the reign of Isabel ii (1833-1868): introduction to his study”. Documenta & Instrumenta - Documenta et Instrumenta, vol. 9, vol. 9, 2012, pp. 61-73, doi: https://doi.org/10.5209/rev_DOCU.2011.v9.38065.