APA (7th ed.) Citation

Harkness, J. C. (1994). The normal principles of education: An address [μικροφίσα]. Research Publications.

Chicago Style (17th ed.) Citation

Harkness, John C. The Normal Principles of Education: An Address [μικροφίσα]. Woodbridge, CT: Research Publications, 1994.

MLA (8th ed.) Citation

Harkness, John C. The Normal Principles of Education: An Address [μικροφίσα]. Research Publications, 1994.