Ayers, D., & Harrison, D. (1991). Advertising Art of Steiff: Teddy Bears und Playthings. Hobby House Press.
Citazione stile Chigago Style (17a edizione)Ayers, Dottie, e Donna Harrison. Advertising Art of Steiff: Teddy Bears Und Playthings. Cumberland: Hobby House Press, 1991.
Citatione MLA (8a ed.)Ayers, Dottie, e Donna Harrison. Advertising Art of Steiff: Teddy Bears Und Playthings. Hobby House Press, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.