Schmahl, W. (1989). Redefining the process of retirement: An international perspective. Springer-Verlag.
Chicago-viite (17. p.)Schmahl, Winfried. Redefining the Process of Retirement: An International Perspective. Berlin: Springer-Verlag, 1989.
MLA-viite (9. p.)Schmahl, Winfried. Redefining the Process of Retirement: An International Perspective. Springer-Verlag, 1989.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.