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Wie viel Sparen fürs Alter ist sinnvoll?
Numberger, Siegfried, (2005)
The Differential Factors Influencing Saving through Life Insurance and Special Focus on Interest-Rate
Zhuo, Zhi, (1998)
BEA - Bureau of Economic Analysis - National Economic Accounts
A Control Theory Analysis of a Finite Optimum Savings Program in a Two-Sector Model.
Bell, D J, (1973)
Planning corporate manpower
Bell, David J., (1974)
Manpower planning. A bibliography
Lewis, Christopher G., (1969)