”I was motivated by my conscience,” says Tiananmen letter author
The Wall Street Journal, May 29, 2015
http://blogs.wsj.com/chinarealtime/2015/05/29/i-was-motivated-by-my-conscience-says-tiananmen-letter-author/
專訪張博樹：「六四」是中國政治思潮分水嶺 (Interview with Zhang Boshu: June Fourth marks a watershed in Chinese political thought)
British Broadcasting Corporation, June 1, 2015
http://www.bbc.co.uk/zhongwen/trad/china/2015/06/150601_tiananmen_zhang_boshu_interview