APA引文

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

Chicago Style (17th ed.) Citation

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

MLA引文

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