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1LlyfrCyhoeddwyd 1982“...European Centre for the Co-ordination of Research and Documentation in Social Sciences...”
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2LlyfrCyhoeddwyd 1979“...European Centre for the Co-ordination of Research and Documentation in Social Sciences...”
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3LlyfrCyhoeddwyd 1979“...European Centre for the Co-ordination of Research and Documentation in Social Sciences...”
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4LlyfrCyhoeddwyd 1969“...European Centre for the Co-ordination of Research and Documentation in Social Sciences...”
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5Trafodyn Cynhadledd LlyfrCyhoeddwyd 1984“...European Centre for the Co-ordination of Research and Documentation in Social Sciences...”
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6LlyfrCyhoeddwyd 1972“...European Centre for the Co-ordination of Research and Documentation in Social Sciences...”
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7LlyfrCyhoeddwyd 1983“...European Centre for the Co-ordination of Research and Documentation in Social Sciences...”
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8Llyfrgan Grootings, Peter“...European Centre for the Co-ordination of Research and Documentation in Social Sciences...”
Cyhoeddwyd 1986