1974

London : Hutchinson University Library

University of Toronto Press, Toronto, Buffalo, London

1972

London : Hutchinson University Library

1974

Hutchinson University Library, London

Toronto, Buffalo, London; The City of Toronto and University of Toronto Press

University of London Institute of Education

University of London Institute of Education

University of London Institute of Education

University of London Institute of Education

Seattle/London, University of Washington Press 1996

Seattle, London, University of Washington Press 1974.

Seattle - London, University of Washington Press, 1977, Auflage: 2.

Seattle/London. University of Washington. 1978

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Seattle/London, University of Washington Press