Cita APA (7a ed.)
Hopper, E. (1971). Readings in the Theory of Educational Systems. Hutchinson University.
Cita estilo Chicago (17a ed.)
Hopper, Earl. Readings in the Theory of Educational Systems. Londres, Inglaterra: Hutchinson University, 1971.
Cita MLA (9a ed.)
Hopper, Earl. Readings in the Theory of Educational Systems. Hutchinson University, 1971.
Precaución: Estas citas no son 100% exactas.