APA
World Congress of Soil Science, Instituto Nacional de Estadística y Geografía (México), . (1994). Research for maximum yield in harmony with nature. Acapulco, Guerrero, México: International Society of Soil Science.
Chicago
World Congress of Soil Science, Instituto Nacional de Estadística y Geografía (México), . 1994. Research for maximum yield in harmony with nature. Acapulco, Guerrero, México: International Society of Soil Science.
Harvard
World Congress of Soil Science, Instituto Nacional de Estadística y Geografía (México), . (1994). Research for maximum yield in harmony with nature. Acapulco, Guerrero, México: International Society of Soil Science.
MLA
World Congress of Soil Science, Instituto Nacional de Estadística y Geografía (México), . Research for maximum yield in harmony with nature. Acapulco, Guerrero, México: International Society of Soil Science. 1994.