Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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