Lua APA (7ú heag.)
DENTON, F., & SPENCER, B. (2000). POPULATION AGING AND ITS ECONOMIC COSTS: A SURVEY OF THE ISSUES AND EVIDENCE.
Lua i Stíl Chicago (17ú heag.)
DENTON, F.T, agus B.G SPENCER. POPULATION AGING AND ITS ECONOMIC COSTS: A SURVEY OF THE ISSUES AND EVIDENCE. 2000.
Lua MLA (9ú heag.)
DENTON, F.T, agus B.G SPENCER. POPULATION AGING AND ITS ECONOMIC COSTS: A SURVEY OF THE ISSUES AND EVIDENCE. 2000.
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