Dyfyniad APA

Allen, J. L. (1995). Environment 95/96 (14th.ed.). Brown and Benchmark Publishers.

Dyfyniad Arddull Chicago

Allen, John L. Environment 95/96. 14th.ed. Connecticut: Brown and Benchmark Publishers, 1995.

Dyfyniad MLA

Allen, John L. Environment 95/96. 14th.ed. Brown and Benchmark Publishers, 1995.

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