2015, Part of book or chapter of book (Ruben, R.; Hoebink, P. (ed.), Coffee certification in East Africa: Impact on farms, families and cooperatives, pp. 83-126)
2014, Part of book or chapter of book (Verwer, S.; Schulpen, L.W.M.; Ruben, R. (ed.), Hoe nu verder? 65 jaar Nederlandse ontwikkelingssamenwerking, pp. 279-286)