John Thomas (writers) and Stephen Hopkins (director). (1990). Predator 2 [ DVD ]. 20th Century Fox . ^ a b Paul W.S. Anderson (writer/director). (2005). Alien vs. Predator [ DVD ]. 20th Century Fox . External links Xiphoid Picture Gallery Source: http://en.wikipedia.org/wiki/Xiphoid Try to find answer in other search engines: Yandex , Google