APA (7th ed.) Citation

Walberg, H. J. (1971). Characteristics of open education: Toward an operational definition. Education Development Center.

Chicago Style (17th ed.) Citation

Walberg, Herbert J. Characteristics of Open Education: Toward an Operational Definition. Newton, Mass.: Education Development Center, 1971.

MLA (8th ed.) Citation

Walberg, Herbert J. Characteristics of Open Education: Toward an Operational Definition. Education Development Center, 1971.