CITEREFBloggs1974
wdinfobox
CITEREFOpie,_Frederick_Douglass2013
CITEREFWaxman
CITEREFPlayfairStittMolonyToomer2007
CITEREFCordell2001
CITEREFMumford1999
CITEREFDoe,_John2005
CITEREFViollet_B,_Andreelli_F,_Jørgensen_SB2003
CITEREFDoe2005