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Johnston, Philip J.R.V.. (s.a). British Education Index (Vol. 26 (January - December 1990)). Leeds: Leeds University Press.

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Johnston, Philip J.R.V.. British Education Index. Vol. 26 (January - December 1990) Leeds: Leeds University Press, s.a. Text.

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Johnston, Philip J.R.V.. British Education Index. Vol. 26 (January - December 1990) Leeds: Leeds University Press, s.a. Text.

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Johnston, Philip J.R.V.. British Education Index. Vol. 26 (January - December 1990) Leeds: Leeds University Press, s.a. Print.