Gaya APA

Effective English. (2012). Jawa tegah: Global.

Gaya Chicago

Effective English. 1. Jawa tegah: Global, 2012. .

Gaya MLA

Effective English. 1. Jawa tegah: Global, 2012. .

Gaya Turabian

Effective English. Jawa tegah: Global, 2012. .