ABBA was a Swedish pop group formed in Stockholm in 1972, comprising Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad.
ABBA have released a special book to celebrate their 40th anniversary.
The Swedish pop group have released ABBA: The Treasures to mark four decades since they released their album Waterloo.
The book includes previously unseen photographs, as well as personal removable memorabilia such as written set lists, tour itineraries and hand-annotated sheet music.
The book has been compiled and written by Ingmarie Halling and Carl Magnus Palm and includes a foreword from all four members of the group. Halling travelled with ABBA on all of their big tours and was responsible for the dressing room, costumes and make-up.
This comes off the back of group member Agnetha Faltskog suggesting the foursome could reunite in 2014 to mark the group's 40th anniversary.