Gulliford, R. (1969). Backwardness and educational failure. National Foundation for Educational Research.
Chicago-Zitierstil (17. Ausg.)Gulliford, Ronald. Backwardness and Educational Failure. Slough: National Foundation for Educational Research, 1969.
MLA-Zitierstil (9. Ausg.)Gulliford, Ronald. Backwardness and Educational Failure. National Foundation for Educational Research, 1969.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.