Graf, A. B. 1. (1981). Tropica, color cyclopedia of exotic plants and trees for warm-region horticulture -- in cool climate, the summer garden or sheltered indoors (2. edition.). East Ruthersford, N.J.: Roehrs Company Publishers.
Chicago Style CitationGraf, Alfred Byrd 1901-2001. Tropica, Color Cyclopedia of Exotic Plants and Trees for Warm-region Horticulture -- in Cool Climate, the Summer Garden or Sheltered Indoors. 2. edition. East Ruthersford, N.J.: Roehrs Company Publishers, 1981.
MLA CitationGraf, Alfred Byrd 1901-2001. Tropica, Color Cyclopedia of Exotic Plants and Trees for Warm-region Horticulture -- in Cool Climate, the Summer Garden or Sheltered Indoors. 2. edition. East Ruthersford, N.J.: Roehrs Company Publishers, 1981.
Warning: These citations may not always be 100% accurate.