APA

Beets W. C., . (1990). Raising and sustaining productivity of smallholder farming systems in the tropics : a handbook of susteinable agricultural development / Willem C. Beets. Alkmaar: Agbé Publishing.

Chicago

Beets Willem C, . 1990. Raising and sustaining productivity of smallholder farming systems in the tropics : a handbook of susteinable agricultural development / Willem C. Beets. Alkmaar: Agbé Publishing.

Harvard

Beets W. C., . (1990). Raising and sustaining productivity of smallholder farming systems in the tropics : a handbook of susteinable agricultural development / Willem C. Beets. Alkmaar: Agbé Publishing.

MLA

Beets Willem C, . Raising and sustaining productivity of smallholder farming systems in the tropics : a handbook of susteinable agricultural development / Willem C. Beets. Alkmaar: Agbé Publishing. 1990.