Interoperability testing for the Internet printing protocol. - Peter Zehler (ACM Stand., 1998)

Internet Printing Protocol/1.1: Implementor's Guide. - Thomas N. Hastings; Carl-Uno Manros; Peter Zehler; Carl Kugler; Henrik Holst (RFC, 2001)

Internet Printing Protocol (IPP): The 'collection' attribute syntax. - Roger K. DeBry; Tom Hastings; Robert G. Herriot; Kirk Ocke; Peter Zehler (RFC, 2002)