APA

Institute of Education Sciences U.S, . (2004). ERIC database. Washington,D.C: Institute of Education Sciences,U.S. Dept. of Education.

Chicago

Institute of Education Sciences U.S, . 2004. ERIC database. Washington,D.C: Institute of Education Sciences,U.S. Dept. of Education.

Harvard

Institute of Education Sciences U.S, . (2004). ERIC database. Washington,D.C: Institute of Education Sciences,U.S. Dept. of Education.

MLA

Institute of Education Sciences U.S, . ERIC database. Washington,D.C: Institute of Education Sciences,U.S. Dept. of Education. 2004.