Theobroma cacao
- Description and uses of cacao, from King's American Dispensatory.
- http://www.henriettesherbal.com/eclectic/kings/theobroma.html

Theobroma grandiflorum, the Cupuacu-Tree
- Description, illustrations, and uses.
- http://www.biologie.uni-hamburg.de/bzf/oknu/theobroma.htm

Theobroma cacao - Erowid Chocolate Vault
- Identification, range, cultivation, and images.
- http://www.erowid.org/plants/cacao/

Theobroma
- Species list with common names, origin, and uses; descriptions and images for T. bicolor, T. cacao, and T. grandiflorum.
- http://www.ciat.cgiar.org/ipgri/fruits_from_americas/frutales/species%20Theobroma.htm

Cacao - Food of the Gods
- Description, uses, and images.
- http://www.botgard.ucla.edu/html/botanytextbooks/economicbotany/Theobroma/

Cacao
- Description from book "Insect Pollination Of Cultivated Crop Plants".
- http://gears.tucson.ars.ag.gov/book/chap5/cacao.html

Theobroma grandiflorum - Cupuacu
- Description and use.
- http://www.rain-tree.com/cupuasu.htm

Cacao, Theobroma cacao
- History and facts from UC Davis.
- http://agronomy.ucdavis.edu/gepts/pb143/crop/cacao/cacao.htm