Gaya APA
FELMER, P, (., PEHKONEN, E, (. (2016).
POSING and solving mathematical problems: .
Berlin:
Springer-Verlag.
Gaya MLA
FELMER, Patricio, (ed)., PEHKONEN, Erkki, (ed).
"POSING and solving mathematical problems:".
Berlin:
Springer-Verlag,
2016.
Buku.