I highly recommend this book:
"SCHERENSCHNITTE"--Designs and Techniques for the Traditional Craft of Papercutting by Suzanne Schlapfer-Geiser was published by Lark Books, Ashville, NC., 1996. This hard cover book has numerous illustrations throughout the text--some in color--as well as line drawn illustrated instructions. Contents includes Materials & Tools; The Basics of Cutting; Folded Cutwork; Free-form or Open Cutting; Positive-Negative Cutwork; Colored Scherenschnitte; Scherenschnitte on Eggs, etc. This hardcover book measures 7 1/4" x 10 1/4" and has 140 pages including Index of Illustrations.
I found my copy on ebay!