http://authorities.loc.gov 14/08/12: (d.n.)

http://en.wikipedia.org/wiki/Gladys_Knight14/08/12: (cantora americana, membro do grupo Gladys Knight e The Pips; d.n.; n.c.)

http://catalogue.bnf.fr/ 14/08/12: (d.n.; n.c.)

http://catalogo.bnportugal.pt/ 14/08/12