Trích dẫn APA

(1978). Agronomic - economic research on soils of the tropics. Annual report for 1976 - 1977. USA: U.S.Agency for International Development.

Trích dẫn kiểu Chicago

Agronomic - Economic Research On Soils of the Tropics. Annual Report for 1976 - 1977. USA: U.S.Agency for International Development, 1978.

Trích dẫn MLA

Agronomic - Economic Research On Soils of the Tropics. Annual Report for 1976 - 1977. USA: U.S.Agency for International Development, 1978.

Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.