Magness J.R. et al. 1971. Food and feed crops of the United States.
TamarindJulia Morton, Fruits of warm climates
And outside links to more Tamarind info:
TAMARIND "FRUIT FACTS"(Fruit Facts are a series of publications of the the California Rare Fruit Growers, Inc. that contain information on individual fruits, including botanical identification, description and culture notes based on California research, and characteristics of cultivars).
Bibliography of Tamarindus indica from Fruits for the Future.
Tamarinds from M. Grieve's Modern Herbal.
Chemical analysis from the FAO's Tropical Feeds Database.