Villegas, J. A. (1983). A resource book of ideascience: Instructional devices, projects, enrichment activities. SEAMEO-RECSAM and German Agency for Technical Cooperation (GTZ).
Chicago-referens (17:e uppl.)Villegas, Jessie A. A Resource Book of Ideascience: Instructional Devices, Projects, Enrichment Activities. Penang, Malaysia: SEAMEO-RECSAM and German Agency for Technical Cooperation (GTZ), 1983.
MLA-referens (9:e uppl.)Villegas, Jessie A. A Resource Book of Ideascience: Instructional Devices, Projects, Enrichment Activities. SEAMEO-RECSAM and German Agency for Technical Cooperation (GTZ), 1983.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.