Hopper, E., & Hopper, E. (1971). Readings in the theory of educational systems.
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Chicago Style (17th ed.) Citation
Hopper, Earl, and Earl Hopper. Readings in the Theory of Educational Systems. 1971.
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MLA (9th ed.) Citation
Hopper, Earl, and Earl Hopper. Readings in the Theory of Educational Systems. 1971.
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Warning: These citations may not always be 100% accurate.