“A Guidebook to Handcuffs and Other Restraints of the World” by Alex R Nichols, 2002. The most comprehensive book to date on the subject, it contains a survey of modern restraints as well as chapters on ancient and medieval items. Essential reading for all handcuff collectors. The book measures 238 x 160 mms, has 304 pages and about 720 illustrations. Also included is a four page supplement containing some corrections and additional items.
Available at Handcuff Warehouse: http://www.handcuffwarehouse.com/gutohaandotr.html