APA (7th ed.) Citation

Duckham, A. N. (1971). Farming systems of the world.

Chicago Style (17th ed.) Citation

Duckham, Alec Narraway. Farming Systems of the World. 1971.

MLA (9th ed.) Citation

Duckham, Alec Narraway. Farming Systems of the World. 1971.

Warning: These citations may not always be 100% accurate.