APA
Ponnamperuma, . (1981). Specific soil chemical characteristics for rice production in Asia. Washington-US: United States Agency for International Development.
Chicago
Ponnamperuma, . 1981. Specific soil chemical characteristics for rice production in Asia. Washington-US: United States Agency for International Development.
Harvard
Ponnamperuma, . (1981). Specific soil chemical characteristics for rice production in Asia. Washington-US: United States Agency for International Development.
MLA
Ponnamperuma, . Specific soil chemical characteristics for rice production in Asia. Washington-US: United States Agency for International Development. 1981.