Hrefna Sigurjónsdóttir

Náttúrufræðimenntun á Snæfellsnesi : vor 2007 : skýrsla 2 : Grunnskóli Grundarfjarðar

Allyson Macdonald, Auður Pálsdóttir, Hrefna Sigurjónsdóttir, 2007 .

Aggression and dominance in matched groups of subadult Icelandic horses (Equus caballus)

Hilde Vervaecke, Han de Vries, Hrefna Sigurjónsdóttir, 2007, Journal of Ethology.

Social relationships in a group of horses without a mature stallion

Hrefna Sigurjónsdóttir, M. Dierendonck, Machteld C. Van Dierendonck, 2003 .