APA

Cottenie A., . (1980). Soil and plant testing as a basis of fertilizer recommendations. Rome, Italy: Food and Agriculture Organization of the United Nations.

Chicago

Cottenie A, . 1980. Soil and plant testing as a basis of fertilizer recommendations. Rome, Italy: Food and Agriculture Organization of the United Nations.

Harvard

Cottenie A., . (1980). Soil and plant testing as a basis of fertilizer recommendations. Rome, Italy: Food and Agriculture Organization of the United Nations.

MLA

Cottenie A, . Soil and plant testing as a basis of fertilizer recommendations. Rome, Italy: Food and Agriculture Organization of the United Nations. 1980.