Williams, N. (2002). Limited energy systems: A guide to alarm, signaling, remote-control, and communications circuits. Quincy, Mass: NFPA.
استشهاد بنمط شيكاغوWilliams, Noel. Limited Energy Systems: A Guide to Alarm, Signaling, Remote-control, and Communications Circuits. Quincy, Mass: NFPA, 2002.
MLA استشهادWilliams, Noel. Limited Energy Systems: A Guide to Alarm, Signaling, Remote-control, and Communications Circuits. Quincy, Mass: NFPA, 2002.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.