Dyfyniad APA

Barr, J. (1971). The environmental handbook: Action guide for the U.K. London: A Ballantine Friends of the Earth Book.

Dyfyniad Arddull Chicago

Barr, John. The Environmental Handbook: Action Guide for the U.K. London: A Ballantine Friends of the Earth Book, 1971.

Dyfyniad MLA

Barr, John. The Environmental Handbook: Action Guide for the U.K. London: A Ballantine Friends of the Earth Book, 1971.

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