Karanja, GG; Sitati, NW; Leader-Williams. Wildlife and People: Conflict and Conservation in Masai Mara, Kenya (PDF). Wildlife and Development Series (London:
香港中環的都爹利街的石頭階級設有4支煤氣燈,至今仍然使用中。 P. James and N. Thorpe, Ancient inventions (Michael O Mara Books, 1995), pp. 427 (页面存档备份,存于互联网档案馆)-428: citing Ch'ang Ch'ü (常璩, a geographer)