एपीए उद्धरण

United nations industrial development organization Vienna. (1973). The petrochemical industry. New York: United Nation.

शिकागो स्टाइल उद्धरण

United nations industrial development organization Vienna. The Petrochemical Industry. New York: United Nation, 1973.

एमएलए उद्धरण

United nations industrial development organization Vienna. The Petrochemical Industry. New York: United Nation, 1973.