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The leadership role of the vocational agriculture teacher: a study of his participation and responsibilities in professional and community organizations
Die Königlich Preußische Akademie der Wissenschaften zu Berlin im Kaiserreich, hrsg. von Jürgen Kocka unter Mitarbeit von Rainer Hohlfeld und Peter Th. Walter, Berlin:: AkademieVerlag 1999, 486 S.
Provisional agenda item 10: representation of the Executive Committee at the XXIII Meeting of the Directing of PAHO, XXII Meeting of the Regional Committee of WHO for the Americas
Provisional agenda item 17: representation of the Executive Committee at the XVIII Pan American Sanitary Conference, XXII Meeting of the Regional Committee of the World Health Organization for the Americas