APA (7th ed.) Citation

Kratzmeier, H., Horn, R., & Kratzmeier, H. (1980). Advanced progressive matrices. Advanced progressive matrices [APM].

Chicago Style (17th ed.) Citation

Kratzmeier, Heinrich, Ralf Horn, and Heinrich Kratzmeier. "Advanced Progressive Matrices." Advanced Progressive Matrices [APM] 1980.

MLA (8th ed.) Citation

Kratzmeier, Heinrich, et al. "Advanced Progressive Matrices." Advanced Progressive Matrices [APM], 1980.