Popham, W. J. (1978). Criterion-referenced measurement. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Popham, W. James. Criterion-referenced Measurement. Englewood Cliffs, N.J.: Prentice-Hall, 1978.
Lua MLA (8ú heag.)Popham, W. James. Criterion-referenced Measurement. Prentice-Hall, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.