Schwartz, A. (1972). Hobbies: An introduction to crafts, collections, nature study, and other life-long pursuits. Drawings by Barbara Carmer Schwartz. Simon and Schuster.
Lua i Stíl Chicago (17ú heag.)Schwartz, Alvin. Hobbies: An Introduction to Crafts, Collections, Nature Study, and Other Life-long Pursuits. Drawings by Barbara Carmer Schwartz. New York: Simon and Schuster, 1972.
Lua MLA (9ú heag.)Schwartz, Alvin. Hobbies: An Introduction to Crafts, Collections, Nature Study, and Other Life-long Pursuits. Drawings by Barbara Carmer Schwartz. Simon and Schuster, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.