Schäfer, P. (1978). Process control computer technology: A programmed introduction. Siemens Aktiengesellschaft.
Čikaški stil citiranja (17. izdanje)Schäfer, Peter. Process Control Computer Technology: A Programmed Introduction. Berlin: Siemens Aktiengesellschaft, 1978.
MLA način citiranja (9. izdanje)Schäfer, Peter. Process Control Computer Technology: A Programmed Introduction. Siemens Aktiengesellschaft, 1978.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.