Tree Tomato—Julia Morton, Fruits of Warm Climates
New Horticultural Crops in New Zealand—Errol W. Hewett
Neglected Crops: 1492 from a Different Perspective—J.E. Hernándo Bermejo and J. León (eds.)
"New" Solanums—Charles Heiser and Gregory Anderson
Magness J.R. et al. 1971. Food and feed crops of the United States.
Outside links:
Tamarillo can be found in Lost Crops of the Incas from National Academy Press
TREE TOMATO "FRUIT FACTS" (Fruit Facts are a series of publications of 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).
Tamarillo info from the Department of Food and Agriculture, California.
Fruit nutritional information from Freida's Inc.