Gaya APA
Schulz, J, H.
(1985).
The economics of aging
(
3rd. ed.)
.
Belmont, Calif:
Wadsworth Pub. Co..
Gaya MLA
Schulz, James, H.
"The economics of aging".
3rd. ed.
Belmont, Calif:
Wadsworth Pub. Co.,
1985.
Text.