Cita APA (7th ed.)

Graf, A. B. (1992). Hortica: Color cyclopedia of garden flora in all climates. Roehrs.

Cita Chicago (17th ed.)

Graf, Alfred Byrd. Hortica: Color Cyclopedia of Garden Flora in All Climates. East Rutherford, NJ: Roehrs, 1992.

Cita MLA (9th ed.)

Graf, Alfred Byrd. Hortica: Color Cyclopedia of Garden Flora in All Climates. Roehrs, 1992.