एपीए उद्धरण

Graute,Ulrich. Sustainable development for central and eastern Europe. Springer Verlag.

शिकागो स्टाइल उद्धरण

Graute,Ulrich. Sustainable Development for Central and Eastern Europe. Berlin: Springer Verlag.

एमएलए उद्धरण

Graute,Ulrich. Sustainable Development for Central and Eastern Europe. Springer Verlag.