Ayers, D., & Harrison, D. (1991). Advertising Art of Steiff: Teddy Bears und Playthings. Hobby House Press.
Čikaški stil citiranja (17. izdanje)Ayers, Dottie, i Donna Harrison. Advertising Art of Steiff: Teddy Bears Und Playthings. Cumberland: Hobby House Press, 1991.
MLA način citiranja (8. izdanje)Ayers, Dottie, i Donna Harrison. Advertising Art of Steiff: Teddy Bears Und Playthings. Hobby House Press, 1991.
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