APA (7th ed.) Citation

Efklides, A., Papadaki, M., & Papantoniou, G. Individual differences in feelings of difficulty: The case of school mathematics.

Chicago Style (17th ed.) Citation

Efklides, Anastasia, Maria Papadaki, and Georgia Papantoniou. Individual Differences in Feelings of Difficulty: The Case of School Mathematics.

MLA (9th ed.) Citation

Efklides, Anastasia, et al. Individual Differences in Feelings of Difficulty: The Case of School Mathematics.