NARA-美國國家檔案館--www.archives.gov；
NARA上檔案：“July 2009: Photo of the Day”，其ID=193688432，隻一張照片。圖下說明：“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，奧巴馬和中國副總理王岐山在橢圓辦公室會談後，王舉著奧巴馬簽字的籃球，旁邊是國務委員戴秉國。