Motivational Orientations of High-Achieving Students as Mediators of a Positive Perception of a High-Achieving Classmate: Results from a Cross-national Study - Oh, Hyerim; del Mar Badia, M; Blumen, S; Maakrun, J; Nguyen, Quoc Anh-Thu; Stack, N; Sutherland, Margaret; Wormald, C; Ziegler, Albert (Anales de Psicología, 2016)