types — a number of things or persons sharing a particular characteristic, or set of characteristics, that causes them to be regarded as a group, more or less precisely defined or designated; class; category: a criminal of the most vicious type.
sources — any thing or place from which something comes, arises, or is obtained; origin: Which foods are sources of calcium?
supplies — to furnish or provide (a person, establishment, place, etc.) with what is lacking or requisite: to supply someone clothing; to supply a community with electricity.
roots — a part of the body of a plant that develops, typically, from the radicle and grows downward into the soil, anchoring the plant and absorbing nutriment and moisture.