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.
Shepherd J. Firing at Will : A Manager’s Guide / by Jay Shepherd., 2011 r=on-line. - Текст : электронный.