Schaefer, R. J. (1967). The school as a center of inquiry. Harper & Row.
Cita Chicago (17th ed.)Schaefer, Robert Joseph. The School as a Center of Inquiry. New York: Harper & Row, 1967.
Cita MLA (9th ed.)Schaefer, Robert Joseph. The School as a Center of Inquiry. Harper & Row, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.