APA (7th ed.) Citation

Kuhn, D. (2008). Formal Operations from a Twenty-First Century Perspective. Human Development, 51(1), 48. https://doi.org/10.1159/000113155

Chicago Style (17th ed.) Citation

Kuhn, Deanna. "Formal Operations from a Twenty-First Century Perspective." Human Development 51, no. 1 (2008): 48. https://doi.org/10.1159/000113155.

MLA (9th ed.) Citation

Kuhn, Deanna. "Formal Operations from a Twenty-First Century Perspective." Human Development, vol. 51, no. 1, 2008, p. 48, https://doi.org/10.1159/000113155.