Gaya APA

Gertler, P., Gaag, J, V, D. (1995). The Willingness To Pay For Medical Care ; Evidence From Two Developing Countries . Maryland: The Johns Hopkins University Press.

Gaya MLA

Gertler, Paul., Gaag, Jacques, Van, Der. "The Willingness To Pay For Medical Care ; Evidence From Two Developing Countries". Maryland: The Johns Hopkins University Press, 1995. Text.