NBOI, the Netherlands Agency for Research Information, & de Lavieter, L. (1994). Directory of research information systems: A guide to online databases on organizations, scientistists, research programs and projects. Laurens de Lavieter.
Παραπομπή σε μορφή Chicago (17η εκδ.)NBOI, the Netherlands Agency for Research Information, και Laurence de Lavieter. Directory of Research Information Systems: A Guide to Online Databases on Organizations, Scientistists, Research Programs and Projects. Amsterdam: Laurens de Lavieter, 1994.
Παραπομπή σε μορφή MLA (8th εκδ.)NBOI, the Netherlands Agency for Research Information, και Laurence de Lavieter. Directory of Research Information Systems: A Guide to Online Databases on Organizations, Scientistists, Research Programs and Projects. Laurens de Lavieter, 1994.
