International study of achievement in mathematics.

Xehetasun bibliografikoak
Egile nagusia:	Husen, Torsten 1916-
Erakunde egilea:	International Project for the Evaluation of Educational Achievement
Formatua:	Liburua
Argitaratua:	Stockholm, New York Almqvist & Wiksell Wiley [1967].
Gaiak:	Mathematical ability. Mathematics > Study and teaching (Secondary) Comparative education.