(帮助) 引文格式1维护:冗余文本 (link) Why does alexandrite appear to change color in sunlight and artificial light?. [2014-08-26]. (原始内容存档于2014-07-14). "Alexandrite
FollowTheMoney.org Political contributions from Influence Explorer at the Sunlight Foundation Charles Koch (页面存档备份,存于互联网档案馆) at Bloomberg L.P. Robinson, Peter