Gaya APA

Hartono, S, Z, T, H, D, K, P. (2013). Spiritual Problem Solving . Yokyakarta: Pro-U Media.

Gaya MLA

Hartono, Solikhin, Zero, To, Hero, Dan, Kang, Puji. "Spiritual Problem Solving". Yokyakarta: Pro-U Media, 2013. Text.