Cita APA (7a ed.)
Koester, U. (1987). Trade in agricultural products among African countries.
Cita Chicago Style (17a ed.)
Koester, Ulrich. Trade in Agricultural Products Among African Countries. 1987.
Cita MLA (9a ed.)
Koester, Ulrich. Trade in Agricultural Products Among African Countries. 1987.
Precaución: Estas citas no son 100% exactas.