APA Style

Kusumaratna, R, K., Hidayat, A. (2011). Protein intake as a determinant factor of physical activity in older persons . Jakarta: Trisakti University press.

MLA Style

Kusumaratna, Rina, K.., Hidayat, Adi. "Protein intake as a determinant factor of physical activity in older persons". Jakarta: Trisakti University press, 2011. Text.