NARA-美国国家档案馆--www.archives.gov；
NARA上档案：“July 2009: Photo of the Day”，其ID=193688432，只一张照片。图下说明：“Chinese Vice Premier Wang Qishan, center, holds the autographed basketball given to him by President Barack Obama following their Oval Office meeting Tuesday, July 28, 2009, to discuss the outcomes of the first U.S.-China Strategic and Economic Dialogue. Looking on at left is Chinese State Councilor Dai Bingguo”。2009年7月28日，奥巴马和中国副总理王岐山在椭圆办公室会谈后，王举着奥巴马签字的篮球，旁边是国务委员戴秉国。
