Barr, J. (1971). The environmental handbook: Action guide for the U.K. London: A Ballantine Friends of the Earth Book.
Trích dẫn kiểu ChicagoBarr, John. The Environmental Handbook: Action Guide for the U.K. London: A Ballantine Friends of the Earth Book, 1971.
Deismireacht MLABarr, John. The Environmental Handbook: Action Guide for the U.K. London: A Ballantine Friends of the Earth Book, 1971.
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