APA (7th ed.) Citation

COX, M., ELEN, J., & STEEGEN, A. A test to measure students' systems thinking abilities in geography. European Association of Geographers.

Chicago Style (17th ed.) Citation

COX, Marjolein, Jan ELEN, and An STEEGEN. A Test to Measure Students' Systems Thinking Abilities in Geography. European Association of Geographers.

MLA (9th ed.) Citation

COX, Marjolein, et al. A Test to Measure Students' Systems Thinking Abilities in Geography. European Association of Geographers.

Warning: These citations may not always be 100% accurate.