Unto this last :
four essays on the first principles of political economy /
John Ruskin ; edited by P. M. Yarker.
Ruskin, J. (1970). Unto this last: four essays on the first principles of political economy. London: Collins.
Ruskin, John, 1819-1900. Unto This Last: Four Essays On the First Principles of Political Economy. London: Collins, 1970.
Warning: These citations may not always be complete (especially for serials).