LASS, A.; QUANDT, R. E. (HRSG.). Union Catalogs at the Crossroad. [s.l.] : Hamburg University Press,2004. DOI: 10.15460/HUP.67. Disponível em: https://hup.sub.uni-hamburg.de/oa-pub/catalog/book/228. Acesso em: 3 juli. 2024.