1. Hong Kong Influenza Has Spread to Singapore. Ming Bao, August 14, 1968.
2. Elderly Women Latest Victims of Influenza. South China Morning Post, August 7, 1968.
3. Influenza Epidemic Is Going Down. Wenhui Bao, August 2, 1968.
4. World Health Organization Weekly Epidemiological Record. 1968;43 (31):387.
5. Medical Staff Are Doing Their Best. Gongshang Ribao, July 28, 1968.