Villegas, J. A. (1983). A resource book of ideascience: Instructional devices, projects, enrichment activities. SEAMEO-RECSAM and German Agency for Technical Cooperation (GTZ).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रVillegas, Jessie A. A Resource Book of Ideascience: Instructional Devices, Projects, Enrichment Activities. Penang, Malaysia: SEAMEO-RECSAM and German Agency for Technical Cooperation (GTZ), 1983.
एमएलए (9वां संस्करण) प्रशस्ति पत्रVillegas, Jessie A. A Resource Book of Ideascience: Instructional Devices, Projects, Enrichment Activities. SEAMEO-RECSAM and German Agency for Technical Cooperation (GTZ), 1983.
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