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Dyfyniad Arddull ChicagoSpringerLink (Online service), Lejf Moos, Olof Johansson, and Christopher Day. How School Principals Sustain Success over Time: International Perspectives. Dordrecht: Springer Netherlands, 2011.
Dyfyniad MLASpringerLink (Online service), et al. How School Principals Sustain Success over Time: International Perspectives. Springer Netherlands, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.