APA (7th ed.) Citation

Ecke, P., Matkin, O. A., & Hartley, D. E. (1990). The Poinsettia manual (3rd ed.). Paul Ecke Poinsettias.

Chicago Style (17th ed.) Citation

Ecke, Paul, O. A. Matkin, and David E. Hartley. The Poinsettia Manual. 3rd ed. Encinitas Calif.: Paul Ecke Poinsettias, 1990.

MLA (9th ed.) Citation

Ecke, Paul, et al. The Poinsettia Manual. 3rd ed. Paul Ecke Poinsettias, 1990.