Gaya APA

Widhiartha, P, A. et al (2008). Lesson Study (Ed. 1., Cet. 1.). Surabaya: Guna Widya.

Gaya MLA

Widhiartha, Putu, Ashintya. et al. "Lesson Study". Ed. 1., Cet. 1. Surabaya: Guna Widya, 2008. Buku.