Παραπομπή σε μορφή APA (7η εκδ.)

Hedegaard, M., Hakkarainen, P., & Engestrom, Y. (1984). Learning and teaching on a scientific basis: Methodological and Epistemological aspects of the activity theory of learning and teaching. Psykologisk Institut.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hedegaard, Mariane, Pentti Hakkarainen, και Yrijo Engestrom. Learning and Teaching on a Scientific Basis: Methodological and Epistemological Aspects of the Activity Theory of Learning and Teaching. Dinamarca: Psykologisk Institut, 1984.

Παραπομπή σε μορφή MLA (9th εκδ.)

Hedegaard, Mariane, et al. Learning and Teaching on a Scientific Basis: Methodological and Epistemological Aspects of the Activity Theory of Learning and Teaching. Psykologisk Institut, 1984.