Bruce, C. R. (1987). Unusual world coins: A standard catalog of world coins companion listing and price guide of novel non-circulating coins. Krause.
Chicago-Zitierstil (17. Ausg.)Bruce, Colin R. Unusual World Coins: A Standard Catalog of World Coins Companion Listing and Price Guide of Novel Non-circulating Coins. Iola, WI: Krause, 1987.
MLA-Zitierstil (9. Ausg.)Bruce, Colin R. Unusual World Coins: A Standard Catalog of World Coins Companion Listing and Price Guide of Novel Non-circulating Coins. Krause, 1987.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.