Bossing, N. L. (1966). Principles of secondary education./2 e (2nd ed.). Prentice-Hall.
Dyfyniad Arddull ChicagoBossing, Nelson L. Principles of Secondary Education./2 E. 2nd ed. New Delhi: Prentice-Hall, 1966.
Dyfyniad MLABossing, Nelson L. Principles of Secondary Education./2 E. 2nd ed. Prentice-Hall, 1966.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.