Não informado. (1978). Key to economic science and managerial sciences. Martinus Nijhoff.
Chicago-referens (17:e uppl.)Não informado. Key to Economic Science and Managerial Sciences. The Hague, Holanda: Martinus Nijhoff, 1978.
MLA-referens (8:e uppl.)Não informado. Key to Economic Science and Managerial Sciences. Martinus Nijhoff, 1978.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.