Cita APA (7th ed.)
GAUTHIER, A., & SMEEDING, T. (2003). TIME USE AT OLDER AGES.
Cita Chicago (17th ed.)
GAUTHIER, A.H, i T.M SMEEDING. TIME USE AT OLDER AGES. 2003.
Cita MLA (9th ed.)
GAUTHIER, A.H, i T.M SMEEDING. TIME USE AT OLDER AGES. 2003.
Atenció: Aquestes cites poden no estar 100% correctes.