Carambola—Julia Morton, Fruits of warm climates
Tropical Fruits—Mary Lamberts and Jonathan H. Crane
Commercialization of Carambola, Atemoya, and Other Tropical Fruits in South Florida—Jonathan H. Crane
Magness J.R. et al. 1971. Food and feed crops of the United States.
And outside links to more starfruit info:
CARAMBOLA "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).
Starfruit Nutritional Facts provided by Friedas.