http://repository.uhamka.ac.id/id/eprint/11999/
Peer reviu_Development E-Module Three Variables Linear Equations System Based On Mathematic Communication
Samsul Maarif, SMF
http://repository.uhamka.ac.id/id/eprint/11999/1/SINTA%203_Developing%20E-Module%20Three%20Liner%20Variabel.pdf