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  1. 1

    Case study research principles and practices gan Gerring, John 1962-

    Cyhoeddwyd 2017
    Llyfr

    Case study research principles and practices
  2. 2

    Case study research principles and practices gan Gerring, John 1962-

    Cyhoeddwyd 2007
    Llyfr

    Case study research principles and practices

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