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2article bibliotecaUNESCO
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4book bibliotecaUNESCO
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5book bibliotecaUNESCO
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9book bibliotecaUNESCO
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10article bibliotecaUNESCO
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11book bibliotecaUNESCO
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12programme and meeting document bibliotecaUNESCO
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14programme and meeting document bibliotecaUNESCO
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15programme and meeting document bibliotecaUNESCO
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16by Meeting of Experts on the Teaching of the Social Sciences at Pre-university Level, Paris, 1960, Jayasuriya, J.E., Jayaweera, Swarnaprogramme and meeting document bibliotecaUNESCO
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17by Meeting of Experts on the Teaching of the Social Sciences at Pre-university Level, Paris, 1960, Jayasuriya, J.E., Jayaweera, Swarnaprogramme and meeting document bibliotecaUNESCO
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