Παραπομπή σε μορφή APA (7η εκδ.)

Costa, D. L. (1999). American living standards: Evidence from recreational expenditures. National Bureau of Economic Research.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Costa, Dora L. American Living Standards: Evidence from Recreational Expenditures. Cambridge: National Bureau of Economic Research, 1999.

Παραπομπή σε μορφή MLA (9th εκδ.)

Costa, Dora L. American Living Standards: Evidence from Recreational Expenditures. National Bureau of Economic Research, 1999.