Hockenberry, T., & Hockenberry, D. (1989). Collectible German Animals Value Guide, 1948-1968: An Identification and Price Guide to Steiff, Schuco, Hermann, and Other German Companies. Hobby House Press, Inc.
Lua i Stíl Chicago (17ú heag.)Hockenberry, Tom, agus Dee Hockenberry. Collectible German Animals Value Guide, 1948-1968: An Identification and Price Guide to Steiff, Schuco, Hermann, and Other German Companies. Cumberland/ Marayland: Hobby House Press, Inc, 1989.
Lua MLA (8ú heag.)Hockenberry, Tom, agus Dee Hockenberry. Collectible German Animals Value Guide, 1948-1968: An Identification and Price Guide to Steiff, Schuco, Hermann, and Other German Companies. Hobby House Press, Inc, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.