↑ Benjamin W. Fortson IV, Indo-European Language and Culture: An Introduction, 2nd ed. (2010, Blackwell), pg. 431, "Because of their mutual intelligibility, Serbian, Croatian, and Bosnian are usually thought of as constituting one language called Serbo-Croatian."
↑ Václav Blažek, "On the Internal Classification of Indo-European Languages: Survey" retrieved 20 Oct 2010, pp. 15-16.
