ESSEN ELECTRONICS. (1987). SN-PC PC-XT USER MANNUAL. ESSEN ELECTRONICS.
Čikaški stil citiranja (17. izdanje)ESSEN ELECTRONICS. SN-PC PC-XT USER MANNUAL. BOMBAY: ESSEN ELECTRONICS, 1987.
MLA način citiranja (9. izdanje)ESSEN ELECTRONICS. SN-PC PC-XT USER MANNUAL. ESSEN ELECTRONICS, 1987.
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