Source, in full
According to The Quote Investigator, this phrase first appeared on PIMA’s North American Papermaker: The Official Publication of the Paper Industry Management Association, in an article by Bill Moore and Jerry Rose. The year was 2000. Since then, the phrase has appeared many times. Peter Drucker died in 2005. The first time his name was associated to the citation was on 2011. Other occurrences and versions of the phrase can be found at