Ebel, R. L., & Frisbie, D. A. (1991). Essentials of educational measurement (5th ed.). Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Ebel, Robert L., agus David A. Frisbie. Essentials of Educational Measurement. 5th ed. Englewood Cliffs, N.J: Prentice-Hall, 1991.
Lua MLA (9ú heag.)Ebel, Robert L., agus David A. Frisbie. Essentials of Educational Measurement. 5th ed. Prentice-Hall, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.