For those who prefer cars to motorcycles
Alfa Romeo: Catalogue Raisonne 1910-1989
Paolo Altiere & Marco Matteucci (Eds)
Everything you could possibly want to know about the fabulous Alpha Romeo, its history, its technical specifications, its huge array of models, its racing successes and its superb mechanics and designers is in here. And it is accompanied by a massive selection of photographs.
This is a beautiful two-volume set in a matching slipcase. There are two large quarto volumes with red boards and red dust jackets and the slipcase is red with green four-leaf clover motif. The text is in English, French and Italian so you get the added bonus of brushing up on your languages while perusing.