Gaya APA
Heckhausen, J., Heckhausen, H. (2018).
Motivation and Action (Third Edition).
Switzerland:
Springer International Publishing AG.
Gaya MLA
Heckhausen, Jutta., Heckhausen, Heinz.
"Motivation and Action".
Third Edition
Switzerland:
Springer International Publishing AG,
2018.
e-book.