Harrison, P. (1987). The greening of Africa: Breaking through in the battle for land and food. Penguin.
Citazione stile Chigago Style (17a edizione)Harrison, Paul. The Greening of Africa: Breaking Through in the Battle for Land and Food. New York, N.Y: Penguin, 1987.
Citatione MLA (9a ed.)Harrison, Paul. The Greening of Africa: Breaking Through in the Battle for Land and Food. Penguin, 1987.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.