Butts, D. P., Lee, A. E., & Tatchell, M. (1967). The story of chocolate. Steck-Vaughn.
Lua i Stíl Chicago (17ú heag.)Butts, David P., Addison E. Lee, agus Mac Tatchell. The Story of Chocolate. Austin, TX: Steck-Vaughn, 1967.
Lua MLA (9ú heag.)Butts, David P., et al. The Story of Chocolate. Steck-Vaughn, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.