Levintow, D. (1961). Worker's education: Study guide. University of the Philippines, Asian Labor Education Center.
Lua i Stíl Chicago (17ú heag.)Levintow, David. Worker's Education: Study Guide. Quezon City: University of the Philippines, Asian Labor Education Center, 1961.
Lua MLA (9ú heag.)Levintow, David. Worker's Education: Study Guide. University of the Philippines, Asian Labor Education Center, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.