Não informado. (1978). Key to economic science and managerial sciences. Martinus Nijhoff.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Key to Economic Science and Managerial Sciences. The Hague, Holanda: Martinus Nijhoff, 1978.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Key to Economic Science and Managerial Sciences. Martinus Nijhoff, 1978.
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