1)- E Perez Romero. [Transhumance, the wool trade, and credit: the Compania de Ganaderos de las Provincias de Soria y Burgos, 1781-1800].Historia agraria. 2001, (23): 119-46
2)- R Lanza Garcia. [The development of Cantabrian livestock from the 16th to the 19th century: an early regional specialization].Historia agraria. 2001, (23): 79-118