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Vasiliki Plerou, Parameswaran Gopikrishnan, Bernd Rosenow, Luis Amaral, Thomas Guhr and H. Eugene Stanley (2002). "Random matrix approach to cross correlations in financial data". Physical Review E. 65 (6): 066126. arXiv:cond-mat/0108023. Bibcode:2002PhRvE..65f6126P. doi:10.1103/PhysRevE.65.066126.Pemeliharaan CS1: Banyak nama: authors list (link)
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Ricardo Hausmann, Cesar Hidalgo; et al. "The Atlas of Economic Complexity". The Observatory of Economic Complexity (Harvard HKS/CDI - MIT Media Lab). Diarsipkan dari versi asli tanggal 2018-12-26. Diakses tanggal 26 April 2012.Pemeliharaan CS1: Penggunaan et al. yang eksplisit (link)