Tooley 2014, p.59. Tooley, T. Hunt (2014) [1999]. «The Hindenburg Program of 1916: A Central Experiment in Wartime Planning» [O Programa Hindenburg de 1916: um experimento central em planejamento de guerra]. Auburn, AL: Ludwig von Mises Institute. The Quarterly Journal of Austrian Economics. 2 (2): 51–62. ISSN1098-3708. doi:10.1007/s12113-999-1012-0. 4633501923 – via www.mises.org/library|acessodata= requer |url= (ajuda)
Tooley 2014, p.59. Tooley, T. Hunt (2014) [1999]. «The Hindenburg Program of 1916: A Central Experiment in Wartime Planning» [O Programa Hindenburg de 1916: um experimento central em planejamento de guerra]. Auburn, AL: Ludwig von Mises Institute. The Quarterly Journal of Austrian Economics. 2 (2): 51–62. ISSN1098-3708. doi:10.1007/s12113-999-1012-0. 4633501923 – via www.mises.org/library|acessodata= requer |url= (ajuda)