Imprint varies: 3d ed. 1972: Europ-Elite S.A.; 4th ed. 1980-81-6th ed. 1985: Editions Servi-Tech; 7th ed. 1987-88: Waterloo-Belgique : Editions Database.
In French; vols. for 1981/82-<1985> have added prefaces in Danish, Dutch, English, German, Greek and Italian.