Παραπομπή APA

Gramlich, E. M., & Koshel, P. P. (1975). Educational performance contracting. Washington: Brookings Institution.

Παραπομπή Chicago Style

Gramlich, Edward M., and Patricia P. Koshel. Educational Performance Contracting. Washington: Brookings Institution, 1975.

Παραπομπή MLA

Gramlich, Edward M., and Patricia P. Koshel. Educational Performance Contracting. Washington: Brookings Institution, 1975.

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