Chang, H. (1962). Problem concerning multiplication and distribution of pure seeds in countries with small farms, with special reference to the rice seed certification program of Taiwan, Republic of China. New York: United Nations.

Chang, H.T. Problem Concerning Multiplication and Distribution of Pure Seeds in Countries With Small Farms, With Special Reference to the Rice Seed Certification Program of Taiwan, Republic of China. New York: United Nations, 1962.

Chang, H.T. Problem Concerning Multiplication and Distribution of Pure Seeds in Countries With Small Farms, With Special Reference to the Rice Seed Certification Program of Taiwan, Republic of China. New York: United Nations, 1962.