//-->
Work and retirement. A longitudinal study of men
Parnes, Herbert S., (1980)
Social contribution by the aging
Tibbitts, Clark, (1952)
Planning the older years
Donahue, Wilma Thompson, (1968)
Growing old in a mechanized world : the human problem of a technical revolution
Clark, Frederick Le Gros, (1960)
Ageing in industry : an inquiry, based on figures derived from census reports, into the problem of ageig under the conditions of modern industry
Clark, Frederick Le Gros, (1955)
Woman, work and age : to study the employment of working women throughout their middle lives
Clark, Frederick Le Gros, (1962)