APA (7th ed.) Citation

Institut belge d'information et de documentation & Prins, P. d. (1967). Belgium at the heart of Europe (4th ed.). The Institute.

Chicago Style (17th ed.) Citation

Institut belge d'information et de documentation and Pieter de Prins. Belgium at the Heart of Europe. 4th ed. Brussels: The Institute, 1967.

MLA (9th ed.) Citation

Institut belge d'information et de documentation and Pieter de Prins. Belgium at the Heart of Europe. 4th ed. The Institute, 1967.