Library of Congress	Catalogo della Library of Congress (USA)
	British Library	Catalogo della British Library (UK)
	British Library - Register of Preservation Surrogates
	National Library New Zealand	Catalogo della National Library della Nuova Zelanda (NZ)
	Pasadena Public Library	Catalogo della Pasadena Public Library (USA)
	Royal Library of Denmark (Bibliographies)	Catalogo della Royal Library della Danimarca (DK)