The Complete Guide To Perthshire Paperweights by Colin & Debby Mahoney and Gary & Marge McClanahan. Published in 1997, so it has color photographs of every style of Perthshire paperweight up to that time as well as an intro, charts, design layouts, edition numbers, etc. A flawless book, unlike the first edition of the Caithness guide book, which has missing facts, typos, bad photos, etc.
There is expected to be an updated edition of the Perthshire book in a year or two; to cover the full range of Perthshire up to its closing. The writers of the book have complete Perthshire collections. They are American couples from California.
For a nice range of Murano weights, look at Bob Hall's World Paperweights - Millefiori And Lampwork, published by Schieffer Books. A terrific overview of paperweights from around the world.