Northington, D. K., Scheirer, D. C., & Schneider, E. L. (1996). Art study workbook to accompany the botanical world (2nd ed.). Wm. C. Brown.
Dyfyniad Arddull ChicagoNorthington, David K., Daniel C. Scheirer, and Edward L. Schneider. Art Study Workbook to Accompany the Botanical World. 2nd ed. Dubuque, IA: Wm. C. Brown, 1996.
Dyfyniad MLANorthington, David K., et al. Art Study Workbook to Accompany the Botanical World. 2nd ed. Wm. C. Brown, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.