Gray, J. (1999). Improving schools: Performance and potential. Buckingham: Open University Press.
Chicago Style aipamenaGray, John. Improving Schools: Performance and Potential. Buckingham: Open University Press, 1999.
MLA aipamenaGray, John. Improving Schools: Performance and Potential. Buckingham: Open University Press, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.