Fault-Tolerant Process Interface with Programmable Controllers. - Herbert Barthel (Fault-Tolerant Computing Systems, 1991)

PROFIsafe - Safety Technology with PROFIBUS. - Wolfgang Stripf; Herbert Barthel (The Industrial Information Technology Handbook, 2005)

Verifkation und Test des PROFIsafe-Sicherheitsprofils. - Holger Schlingloff; Mario Friske; Herbert Barthel (Softwaretechnik-Trends, 2008)