Johnson, K. (1980). Evaluating internal control: Concepts, guide-lines, procedues, documentation. Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)Johnson, Kenneth. Evaluating Internal Control: Concepts, Guide-lines, Procedues, Documentation. Wiley and Sons, 1980.
Lua MLA (9ú heag.)Johnson, Kenneth. Evaluating Internal Control: Concepts, Guide-lines, Procedues, Documentation. Wiley and Sons, 1980.
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