David Richardson and William Dollar as the nephew and Drosselmeyer, in a New York City Ballet production of "The Nutcracker."

Billy Rose Theatre Division, The New York Public Library. "David Richardson and William Dollar as the nephew and Drosselmeyer, in a New York City Ballet production of "The Nutcracker."" The New York Public Library Digital Collections. 1957. https://digitalcollections.nypl.org/items/9187ecb0-3f46-0131-c24d-58d385a7bbd0

Billy Rose Theatre Division, The New York Public Library. (1957). David Richardson and William Dollar as the nephew and Drosselmeyer, in a New York City Ballet production of "The Nutcracker." Retrieved from https://digitalcollections.nypl.org/items/9187ecb0-3f46-0131-c24d-58d385a7bbd0

Billy Rose Theatre Division, The New York Public Library. "David Richardson and William Dollar as the nephew and Drosselmeyer, in a New York City Ballet production of "The Nutcracker."" New York Public Library Digital Collections. Accessed December 6, 2025. https://digitalcollections.nypl.org/items/9187ecb0-3f46-0131-c24d-58d385a7bbd0

<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/9187ecb0-3f46-0131-c24d-58d385a7bbd0 | title= (still image; still image) David Richardson and William Dollar as the nephew and Drosselmeyer, in a New York City Ballet production of "The Nutcracker." (1957) | author=Digital Collections, The New York Public Library | accessdate=December 6, 2025 | publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>