Brophy, P. (1986). Computers can read: Machine-readable codes and their applications. Gower Pub. Co.
Lua i Stíl Chicago (17ú heag.)Brophy, Peter. Computers Can Read: Machine-readable Codes and Their Applications. Aldershot, Hants, England: Gower Pub. Co, 1986.
Lua MLA (9ú heag.)Brophy, Peter. Computers Can Read: Machine-readable Codes and Their Applications. Gower Pub. Co, 1986.
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