Dyfyniad APA

Coxhead, I. A. (1991). Environmental specific rates and biases of technical change in agriculture. s.n.

Dyfyniad Arddull Chicago

Coxhead, Ian A. Environmental Specific Rates and Biases of Technical Change in Agriculture. [S.l: s.n, 1991.

Dyfyniad MLA

Coxhead, Ian A. Environmental Specific Rates and Biases of Technical Change in Agriculture. s.n, 1991.

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