SEVI. 371/1579: Briefwisseling Toon Colpaert april 1991-december 1991.
芝加哥风格引文SEVI. 371/1579: Briefwisseling Toon Colpaert April 1991-december 1991.
MLA引文SEVI. 371/1579: Briefwisseling Toon Colpaert April 1991-december 1991.
警告：这些引文格式不一定是100％准确.
APA引文