1. Social structure and dynamic process: the case of modern medicine;Parsons,1951
2. Aŕgonauts of the Western Pacific;Malinowski,1922
3. The Gift: Forms and Functions of Exchange in Archaic Societies;Mauss,1967
4. The principle of reciprocity;Levi-Strauss,1965
5. The gift game;Shurmer;New Society,1971