Gaya APA
Iskandar, A. (2017).
Practical Problem Solving: Step by Step Method for Solving Problems .
Jakarta:
Pt Elex Media Komputindo.
Gaya MLA
Iskandar, Andy.
"Practical Problem Solving: Step by Step Method for Solving Problems".
Jakarta:
Pt Elex Media Komputindo,
2017.
FIC.