Schaefer, R. J. (1967). The school as a center of inquiry. Harper & Row.
Lua i Stíl Chicago (17ú heag.)Schaefer, Robert Joseph. The School as a Center of Inquiry. New York: Harper & Row, 1967.
Lua MLA (9ú heag.)Schaefer, Robert Joseph. The School as a Center of Inquiry. Harper & Row, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.