[Poetic Edda] ==In the Poetic Edda== She is mentioned only once, in Hervor`s appeal to Angantyr: ==Etymology== Her name is a shortened form of Thorfrithr, meaning `beautiful Thor` or `peace of Thor.` ... Found on http://en.wikipedia.org/wiki/Tofa_(Poetic_Edda)
1) Icelandic literature 
[Poetic Edda] ==In the Poetic Edda== She is mentioned only once, in Hervor`s appeal to Angantyr: ==Etymology== Her name is a shortened form of Thorfrithr, meaning `beautiful Thor` or `peace of Thor.` ...