Ruppert, David Edward. Marketing at the crossroads ethnic diversity in a periodic market in the highland Philippines / [microform] : by David Edward Ruppert. - Ann Arbor, Mich. : University Microfilms International, 1979. - 1 microfilm reel : positive ; 35 mm. Thesis (Ph.D.) - University of Arizona, 1979. Subjects--Topical Terms: Ethnic groups. Subjects--Geographic Terms: Philippines--Ethnic relations.