NORTHINGTON, D. K., & SCHNEIDER, E. L. (1996). Art study workbook to accompany the botanical world.--ed.2. WCB.
Lua i Stíl Chicago (17ú heag.)NORTHINGTON, David K., agus Edward L. SCHNEIDER. Art Study Workbook to Accompany the Botanical World.--ed.2. Dubuque: WCB, 1996.
Lua MLA (9ú heag.)NORTHINGTON, David K., agus Edward L. SCHNEIDER. Art Study Workbook to Accompany the Botanical World.--ed.2. WCB, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.