Progress in planning. Vol. 33,Pt.1 : Small town England: population change among small to medium sized urban areas,1971-81 / J.Shepherd,P.Congdon, 1990. - 111 p. - Текст : непосредственный.
Progress in planning. Vol. 34,Pt.3 : analysis of small area social change / P.Congdon, 1990. - 100 p. - Текст : непосредственный.