Nixon, M. (1971). Children's classification skills. Australian Council for Educational Research.
Citazione stile Chigago Style (17a edizione)Nixon, Mary. Children's Classification Skills. [Hawthorn, Australia]: Australian Council for Educational Research, 1971.
Citatione MLA (8a ed.)Nixon, Mary. Children's Classification Skills. Australian Council for Educational Research, 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.