ebrary, Inc, & Petrus, K. (2003). On human persons. Ontos Verlag.
Chicago Style (17th ed.) Citationebrary, Inc, and Klaus Petrus. On Human Persons. Frankfurt: Ontos Verlag, 2003.
MLA引文ebrary, Inc, and Klaus Petrus. On Human Persons. Ontos Verlag, 2003.
警告：這些引文格式不一定是100％准確.