MLA

Niebel,Thomas, O’Mahony,Mary O’Mahony,Mary, and Saam,Marianne Saam,Marianne. The Contribution of Intangible Assets to Sectoral Productivity Growth In the Eu. Mannheim: ZEW, 2013.

APA

Niebel,Thomas, N., O’Mahony,Mary, O., & Saam,Marianne, S. (2013). The contribution of intangible assets to sectoral productivity growth in the EU. Mannheim: ZEW.

Chicago

Niebel,Thomas, O’Mahony,Mary O’Mahony,Mary, and Saam,Marianne Saam,Marianne. The Contribution of Intangible Assets to Sectoral Productivity Growth In the EU. Mannheim: ZEW, 2013.