Kaanel ka: Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Equipment for testing, measuring or monitoring of protective measures. Part 12, Performance measuring and monitoring devices (PMD). (IEC 61557-12:2007). Osa teksti inglise ja prantsuse k. Bibliogr. lk. 80-81. Avaldatud eesti keeles: aprill 2009