एपीए उद्धरण

Heertje, A. (1977). Economics and technical change. London: Weidenfeld & Nicolson.

शिकागो स्टाइल उद्धरण

Heertje, Arnold. Economics and Technical Change. London: Weidenfeld & Nicolson, 1977.

एमएलए उद्धरण

Heertje, Arnold. Economics and Technical Change. London: Weidenfeld & Nicolson, 1977.