„Webster's Revised Unabridged Dictionary (1913 + 1828)”. Heterogeneity. The ARTFL Project, University of Chicago. septembar 2010. Архивирано из оригинала(Part of this paragraph is public domain material copyright 1828 and 1913) 28. 7. 2011. г. Приступљено 10. 9. 2010.
„Webster's Revised Unabridged Dictionary (1913 + 1828)”. Heterogeneous. The ARTFL Project, University of Chicago. septembar 2010. Архивирано из оригинала(Part of this paragraph is public domain material copyright 1828 and 1913) 28. 7. 2011. г. Приступљено 10. 9. 2010.
„Webster's Revised Unabridged Dictionary (1913 + 1828)”. Heterogeneity. The ARTFL Project, University of Chicago. septembar 2010. Архивирано из оригинала(Part of this paragraph is public domain material copyright 1828 and 1913) 28. 7. 2011. г. Приступљено 10. 9. 2010.
„Webster's Revised Unabridged Dictionary (1913 + 1828)”. Heterogeneous. The ARTFL Project, University of Chicago. septembar 2010. Архивирано из оригинала(Part of this paragraph is public domain material copyright 1828 and 1913) 28. 7. 2011. г. Приступљено 10. 9. 2010.