Principal colaborador Susie Boulton, C. C. (1998). Guia American Express. Livraria Civilização Editora.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিPrincipal colaborador Susie Boulton, Christopher Catling. Guia American Express. Livraria Civilização Editora, 1998.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিPrincipal colaborador Susie Boulton, Christopher Catling. Guia American Express. Livraria Civilização Editora, 1998.
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