^Vega- Redondo, Fernando (2007). Complex Social Networks (1st edition ed.). Cambridge: Cambridge [etc.]: Cambridge University Press. p. 312. ISBN9780521674096* 0521674093. {{cite book}}: |access-date= requires |url= (help); |edition= has extra text (help); Check |isbn= value: invalid character (help)
^Hamblin, DeAnna; Bartlett, Marilyn J (Mar2013). "Navigating Social Networks". Vol. 70 (Educational Leadership). Retrieved 13 March 2015. {{cite journal}}: |volume= has extra text (help); Check date values in: |date= (help); Cite journal requires |journal= (help); Missing |author2= (help)