Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.