TOKHEIM, R. L. (1994). Digital electronics.-- ed.4. GLENCOE.
Lua i Stíl Chicago (17ú heag.)TOKHEIM, Roger L. Digital Electronics.-- Ed.4. New York: GLENCOE, 1994.
Lua MLA (9ú heag.)TOKHEIM, Roger L. Digital Electronics.-- Ed.4. GLENCOE, 1994.
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