APA (7th ed.) Citation

Husen, T. (1967). International study of achievement in mathematics: A comparison of twelve countries. A.

Chicago Style (17th ed.) Citation

Husen, Torsten. International Study of Achievement in Mathematics: A Comparison of Twelve Countries. Stockholm, mqvist & Wiksell: A, 1967.

MLA (9th ed.) Citation

Husen, Torsten. International Study of Achievement in Mathematics: A Comparison of Twelve Countries. A, 1967.