History of TV programme trade

If you're interested in the history of TV programme trade and in the early beginnings of formatting TV programs, I would like to draw your attention on the following reports:

1) Television traffic: a one-way street? A survey and analysis of the international flow of television programme material
from Varis and Nordenstreng (1975), UNESCO, which you can find here

and the sequel:
2) International flow of television programmes from Varis (1985), UNESCO, which you can find here.