Leestma, R., & Walberg, H. J. (1992). Japanese educational productivity. Center for Japanese Studies, University of Michigan.
Lua i Stíl Chicago (17ú heag.)Leestma, Robert, agus Herbert J. Walberg. Japanese Educational Productivity. Ann Arbor: Center for Japanese Studies, University of Michigan, 1992.
Lua MLA (9ú heag.)Leestma, Robert, agus Herbert J. Walberg. Japanese Educational Productivity. Center for Japanese Studies, University of Michigan, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.