Johnstone, J. N. (1981). Indicators of education systems. Kogan Page.
Lua i Stíl Chicago (17ú heag.)Johnstone, James N. Indicators of Education Systems. London: Kogan Page, 1981.
Lua MLA (9ú heag.)Johnstone, James N. Indicators of Education Systems. Kogan Page, 1981.
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