Social Democratic Party of Germany | United States National Research Council | Social Democratic Party | National Research Council | Commonwealth Scientific and Industrial Research Organisation | social media | research | Agricultural Research Service | Office of Naval Research | The Social Network | St. Jude Children's Research Hospital | Social Democrats | Cancer Research UK | Social Security Administration | Social Democratic Party (UK) | Medical Research Council (UK) | social democracy | Swedish Social Democratic Party | Social Distortion | Medical Research Council | Chinese Academy of Social Sciences | Getty Research Institute | Social Democrat Radical Party | social | Research Triangle Park | Industrial Research Institute | Catholic social teaching | Australian Research Council | Social democracy | National Center for Atmospheric Research |
From 1987 to 1909 Zapf was co-editor of the „Zeitschrift für Soziologie“, was an advisory member of Social Indicators Research and grant evaluator of the Alexander von Humboldt Foundation.