Não informado. (1990). Personnel Training and Education. Library Association, Personnel Training and Education Group.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Personnel Training and Education. London: Library Association, Personnel Training and Education Group, 1990.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Personnel Training and Education. Library Association, Personnel Training and Education Group, 1990.
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