纳森·雅各布森在數學譜系計畫的資料。 約翰·J·奧康納; 埃德蒙·F·羅伯遜, Jacobson, MacTutor数学史档案 (英语) An interview with William L. Duren, Nathan Jacobson, and EdwardJ. McShane about their experiences
除可解作企業、公司,也有進取、冒險之意。 Scott Andrew Shane. A General Theory of Entrepreneurship: the Individual-Opportunity Nexus. Edward Elgar Publishing. 2003. ISBN 1843769964