Cita APA (7a ed.)
Leedham, J., & Unwin, D. (1971). Programmed learning in the schools.
Cita estilo Chicago (17a ed.)
Leedham, John, y Derick Unwin. Programmed Learning in the Schools. 1971.
Cita MLA (9a ed.)
Leedham, John, y Derick Unwin. Programmed Learning in the Schools. 1971.
Precaución: Estas citas no son 100% exactas.