APA

Orvedal A., . (1981). Bibliography of soils of the tropics vol.4: tropics in general and islands of the pacific and indian oceans. Washington-US: United States Agency for International Development.

Chicago

Orvedal A.C, . 1981. Bibliography of soils of the tropics vol.4: tropics in general and islands of the pacific and indian oceans. Washington-US: United States Agency for International Development.

Harvard

Orvedal A., . (1981). Bibliography of soils of the tropics vol.4: tropics in general and islands of the pacific and indian oceans. Washington-US: United States Agency for International Development.

MLA

Orvedal A.C, . Bibliography of soils of the tropics vol.4: tropics in general and islands of the pacific and indian oceans. Washington-US: United States Agency for International Development. 1981.