Gaya APA

Retnowati, E. et al (2014). Learning more Mathematics 3b (for grade IX Junior high school) . Bandung: Grafindo Media pratama.

Gaya MLA

Retnowati, Endah. et al. "Learning more Mathematics 3b (for grade IX Junior high school)". Bandung: Grafindo Media pratama, 2014. Text.