Gaya APA

Babauta, L., Ishak, Z. (2019). The Miracle of Focus / Keajaiban Fokus . Yogyakarta: Bright Publisher.

Gaya MLA

Babauta, Leo., Ishak, Zulkarnaen. "The Miracle of Focus / Keajaiban Fokus". Yogyakarta: Bright Publisher, 2019. Text.