APA Style

Duendes, D, S., Ball, J. (2010). Just Say Please = Ayo Bilang Tolong: Kisah Tentang Sopan Santun . Jakarta: Gramedia Pustaka Utama.

MLA Style

Duendes, Del, Sur,., Ball, Jacqueline. "Just Say Please = Ayo Bilang Tolong: Kisah Tentang Sopan Santun". Jakarta: Gramedia Pustaka Utama, 2010. Text.