Εργαστήριο Δενδροκομίας Γ.Π.Α.
Plant Physiology Online
Plant Propagation
Citrus Nutrition and Fertilization
Growing olives - Olive orchard management
Citrus orchard management
Fruit & Nut Research and Information Center, University of California
Organic fruit - vegetable growing guidelines
University of California Fruit Report
University of Guelph, Pomology