Institutional models for accelerating agricultural commercialization: Evidence from maize, cotton and horticulture in Zambia, 1965–2012 - Chapoto, Antony; Haggblade, Steven; Hichaambwa, Munguzwe; Kabwe, Stephen; Longabaugh, Steven; Sitko, Nicholas J.; Tschirley, David (Routledge, 2013)