2012 August 22, Bob Curran, A Haunted Mind: Inside the Dark, Twisted World of H.P. Lovecraft, Red Wheel/Weiser, →ISBN, page 63:
One of these was allegedly the Raudskinna or Red Skin, which found its way to Germany.[…]Naturally, the Lutherans accused him of all sorts of wickedness and diabolism, one of which was the Raudskinna.
2018 June 11, Andy Paciorek, Bob Curran, The Wytch Hunters’ Manual, Lulu Press, Inc., →ISBN, page 49:
Not only this, but in order to pass on his dark knowledge, Gottskalk penned a fearsome book — the most formidable book of Icelandic black magic — named Raudskinna, the Red Skinned Book as it was bound in red leather,[…]
2020 May 29, Theresa Bane, Encyclopedia of Mythological Objects, McFarland & Company, →ISBN, page 127:
In Scandinavian folklore, Raudskinna (Redskin) was a book of black magic said to have been written by Bishop Gottskalk grimmi Nikulasson (Gottskalk the Cruel) of Holar in the sixteenth century; legend claims that he was buried with it.
