Gaya APA
Retnawati, B, H. (2017).
Perangkat Pembelajaran Matematika Problem Based Learning (Cet.1).
Yogyakarta:
Parama publishing.
Gaya MLA
Retnawati, Bukhori, Heri.
"Perangkat Pembelajaran Matematika Problem Based Learning".
Cet.1
Yogyakarta:
Parama publishing,
2017.
Text.