Letter of correspondence to Ernst Keller from Peter Drucker urging Keller to take some time off from ADELA. Drucker recommends that Keller takes off four to six weeks. He is insistent that Keller take time off because, in not doing so, Drucker feels that Keller is jeopardizing his own health and the success of ADELA.
Drucker, Peter F. (Peter Ferdinand), 1909-2005 ADELA Investment Company Keller, Ernst, 1931-2006
Source
Letter of correspondence to Ernst Keller from Peter Drucker urging Keller to take some time off from ADELA, March 15, 1972; Drucker Archives; Box 9, Folder 10; 3 pages
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