Digest, S. d. R. (1983). História dos grandes inventos. Selecções do Reader's Digest.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিDigest, Selecções do Reader's. História Dos Grandes Inventos. Selecções do Reader's Digest, 1983.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিDigest, Selecções do Reader's. História Dos Grandes Inventos. Selecções do Reader's Digest, 1983.
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