Vernez, G., Rydell, R, A, K, C, P.(1999).Closing the education gap : Benefist and costs .Washington D.C.:Rand Education.
Gaya MLA
Vernez, Georges., Rydell, Richard, A., Krop;, C., Peter."Closing the education gap : Benefist and costs".Washington D.C.:Rand Education,1999.Koleksi S3.