Wollenberg, E. K. (1991). Urban markets, and rural resource productivity: Incentives for soil conservation among upland farmers in the Philippines. UMI Dissertation Services.
Lua i Stíl Chicago (17ú heag.)Wollenberg, Eva Karolina. Urban Markets, and Rural Resource Productivity: Incentives for Soil Conservation Among Upland Farmers in the Philippines. Ann Arbor, Mich: UMI Dissertation Services, 1991.
Lua MLA (9ú heag.)Wollenberg, Eva Karolina. Urban Markets, and Rural Resource Productivity: Incentives for Soil Conservation Among Upland Farmers in the Philippines. UMI Dissertation Services, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.