@book{UBHD-67800707, title={El siglo XX}, publisher={Editorial Gredos}, address={Madrid}, year={2006}, pages={786 S.}, language={spa}, isbn={84-249-2786-9 and 978-84-249-2786-8}, library={UB [Signatur: bestellt storniert vergriffen] ; RO [Signatur: RO/IQ 00130 G643 H67-2]}, }