एपीए उद्धरण

Crawford , M. (1976). Air pollution control theory. MacGraw - hill company.

शिकागो स्टाइल उद्धरण

Crawford , Martin. Air Pollution Control Theory. USA: MacGraw - hill company, 1976.

एमएलए उद्धरण

Crawford , Martin. Air Pollution Control Theory. MacGraw - hill company, 1976.